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A modular, portable building unit susceptible to air transport and including a roof, foldable side walls and foldable end walls having the same width as the height of the side walls. Three of the modular building units can be interfitted to form a building having four times as much floor space as th

A modular, portable building unit susceptible to air transport and including a roof, foldable side walls and foldable end walls having the same width as the height of the side walls. Three of the modular building units can be interfitted to form a building having four times as much floor space as the single modular building unit. The inclusion of a floor in the modular building unit is optional.

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A modular, portable building unit comprising: a pair of parallel side walls; a flat ceiling extending over and between said side walls, and pivotally connected thereto to allow at least the upper part of said side walls to be pivoted toward a fold-up position in which they extend parallel to the pla

A modular, portable building unit comprising: a pair of parallel side walls; a flat ceiling extending over and between said side walls, and pivotally connected thereto to allow at least the upper part of said side walls to be pivoted toward a fold-up position in which they extend parallel to the plane of the ceiling; hinges pivotally connecting each of said side walls to the flat ceiling at opposite sides of the ceiling to permit said side walls to pivot through 180°from said fold-up position to a position extending horizontally outwardly from said flat ceiling in substantially coplanar alignment with the ceiling, said hinges thus facilitating the extension of one of said side walls in a horizontally extending direction at the ceiling line of the building unit whereby two of said building units can be positioned in parallel relation along side each other and spaced from each other by a distance equal to the height of said side walls, and a side wall of one of said building units then folded outwardly into a horizontally extending position to form a ceiling over the space between said side-by-side parallel building units, with said space opening into one of at least said building units; a pair of end walls extending between and interconnecting said parallel side walls and having a width equal to the height of said side walls, each of said end walls having an upper edge pivotally connected to said ceiling for pivotation about a horizontal axis to facilitate pivoting each end wall up against the ceiling; each of said side walls having upper and lower parts of substantially equal size pivotally joined to each other along a horizontally extending center line of pivotation extending parallel to the plane of the ceiling, said upper and lower parts of each of said side walls being pivotable into superimposed juxtaposition to each other as said upper part is pivoted inwardly and upwardly toward said ceiling.