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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0246979 (1988-09-20) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 5 인용 특허 : 7 |
A variable speed controller for selectively varying a moving speed of a door which is moved between first and second positions by an automatic door operator having a control system and a cylinder with a reciprocating piston therein which is positioned identically with respect to the cylinder when th
A variable speed controller for selectively varying a moving speed of a door which is moved between first and second positions by an automatic door operator having a control system and a cylinder with a reciprocating piston therein which is positioned identically with respect to the cylinder when th
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