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A folding table for the rear of a backrest, the table having a surface with a depression therein in which a carrier for visible material, like an advertisement, is disposed. The carrier is received in an undercut in the depression. Alternatively, a frame around the edge of the carrier has projection

A folding table for the rear of a backrest, the table having a surface with a depression therein in which a carrier for visible material, like an advertisement, is disposed. The carrier is received in an undercut in the depression. Alternatively, a frame around the edge of the carrier has projections received in grooves in the table for holding the frame and thereby the carrier to the surface.

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What is claimed is: 1. A folding table for the rear of a backrest of a seat comprising: a table portion having a rear side which is exposed to view when the table is folded against the backrest; the rear side of the table portion having a depression therein, the periphery of which is undercut along

What is claimed is: 1. A folding table for the rear of a backrest of a seat comprising: a table portion having a rear side which is exposed to view when the table is folded against the backrest; the rear side of the table portion having a depression therein, the periphery of which is undercut along at least a portion thereof; a carrier for a visible object engageably received in the depression; the periphery of the carrier being adapted to the shape of the depression and to grip releasably behind the undercut periphery whereby the carrier is removably retained in the depression; and a connection between the folding table and the backrest, the connection enabling the table to be moved between a folded position in which the carrier is visible and an unfolded position off the backrest; wherein the table portion is comprised of a film encased foam layer having lateral edges; and stiffening rails formed into the lateral edges of the foam layer. 2. A folding table for the rear of the backrest of a seat comprising: a table portion having a rear side which is exposed to view when the table is folded against the backrest; the rear side of the table portion having a depression therein, the periphery of which is undercut along at least a portion thereof; a carrier for a visible object engageably received in the depression; the periphery of the carrier being adapted to the shape of the depression and to grip releasably behind the undercut periphery whereby the carrier is removably retained in the depression; and a connection between the folding table and the backrest, the connection enabling the table to be moved between a folded position in which the carrier is visible and an unfolded position off the backrest; wherein the table portion comprises two injection molded plastic material half shells which are clipped together, with one of the shells being at the carrying surface which is on the side of the table which faces outwardly with the table folded up. 3. A folding table for the rear of the backrest of a seat, comprising: a rear portion visible when the table is folded against the backrest; a depression formed in the rear portion: a carrier for a visible object received in the depression: the carrier including a carrying surface adapted to support the visible object; the periphery of the carrier being adapted to the shape of the depression and engageable into the depression; grooves defined at regions in the rear portion of the table; a frame separate from the carrying surface which is shaped and positioned to engage around the carrier and to engage over at least part of an edge region of the carrier; and projections from the frame which engage in the grooves for holding the frame and thereby for holding the carrier in the depression; wherein the projections comprise a plurality of latching lugs on the periphery of the carrier, the lugs being shaped and positioned for engaging in the grooves. 4. The folding table of claim 3, wherein the grooves correspond in position to respective ones of the latching lugs and are arranged on the periphery of the depression. 5. The folding table of claim 3, wherein the carrier includes a transparent visible surface behind which an advertising carrier may be removably positioned. 6. The folding table of claim 5, further comprising an encircling opaque edge around the transparent visible surface. 7. The folding table of claim 3, wherein the visible object comprises a viewable image screen. 8. The folding table of claim 3, further comprising a bottle or cup holder arranged next to the carrier and separately foldable downward from the seat back or upward toward the seat back. 9. A folding table for placement on the rear side of a backrest of a passenger seat in a vehicle, comprising: a connection between the folding table and the rear side of the backrest for enabling the folding table to be moved between an inoperative position folded up against the backrest and an operative folded down use position; the folding table having a side visible when the folding table is in the inoperative position; the visible side of the table having a depression therein with undercuts or grooves arranged in at least some regions of the depression; a carrier for visible material, the carrier being adapted in shape and size to the depression for being received therein and for holding the carrier in the depression, the depression having a periphery with an undercut therein and the carrier being shaped for fitting into the undercut, and further comprising a groove around the carrier and an elastic, shaped ring disposed in the groove, the shaped ring being formed to extend into the undercut and grip behind the undercut. 10. A folding table for the rear of the backrest of a seat comprising: a table portion having a rear side which is exposed to view when the table is folded against the backrest; the rear side of the table portion having a depression therein, the periphery of which is undercut along at least a portion thereof, wherein the undercut extends around the periphery of the depression; a carrier for a visible object engageably received in the depression; the periphery of the carrier being adapted to the shape of the depression and to grip releasably behind the undercut periphery whereby the carrier is removably retained in the depression, wherein the carrier includes an encircling peripheral recess and an elastic, shaped ring disposed in the encircling recess depression and defining a projection of the carrier which grips in the undercut periphery of the depression; and a connection between the folding table and the backrest, the connection enabling the table to be moved between a folded position in which the carrier is visible and an unfolded position off the backrest. 11. The folding table of claim 10, wherein the elastic, shaped ring comprises a tubular seal. 12. The folding table of claim 10, wherein the carrier includes a transparent visible surface behind which an advertising display may be removably positioned. 13. The folding table of claim 10, wherein the visible object comprises a viewable image screen. 14. The folding table of claim 10, further comprising a bottle or cup holder arranged next to the carrier and separately foldable downward from the seat back or upward toward the seat back. 15. The folding table of claim 10, wherein the fit of the carrier in the undercut portion of the periphery of the depression is such that a tool is required to remove the carrier. 16. The folding table of claim 3, wherein the fit of the frame in the depression is such that a tool is required to release the projections from the grooves. 17. A folding table for placement on the rear side of a backrest of a passenger seat in a vehicle, comprising a table portion; a connection between the table portion and the backrest for enabling the folding table to be moved between a stowed position in which it is folded against the backrest and an extended position away from the backrest; the table portion having a rear side visible when it is in the stowed up position; the rear side of the table portion having a depression therein; a carrier for visible material; the carrier being adapted in shape and size to be received in the depression; and a retaining structure which removably secures the carrier in the depression; the retaining structure being comprised of a first portion on the carrier which releasably engages with a complementary second portion on the depression; wherein: the first portion of the retaining structure is comprised of a groove around the periphery of the carrier and an elastic, shaped ring disposed in the groove; and the shaped ring engages with the undercut portion and wherein the complementary second portion of the retaining structure comprises an undercut region of the periphery of the depression. 18. The folding table of claim 17, wherein the fit of the carrier in the depression is such that a tool is required to release the first portion of the retaining structure from the complementary second portion. 19. A folding table for placement on the rear side of a backrest of a passenger seat in a vehicle, comprising a table portion; a connection between the table portion and the backrest for enabling the folding table to be moved between a stowed position in which it is folded against the backrest and an extended position away from the backrest; the table portion having a rear side visible when it is in the stowed up position; the rear side of the table portion having a depression therein; a carrier for visible material; the carrier being adapted in shape and size to be received in the depression; and a retaining structure which removably secures the carrier in the depression; the retaining structure being comprised of a first portion on the carrier which releasably engages with a complementary second portion on the depression; wherein: the first portion of the retaining structure is comprised of a groove around the periphery of the carrier and an elastic, shaped ring disposed in the groove; and the shaped ring engages with the complementary retaining portion. 20. The folding table of claim 19, wherein the fit of the carrier in the depression is such that a tool is required to release the first portion of the retaining structure from the complementary second portion.