发明授权
US3633954A Unit door closer and latch 失效
单元门锁和锁扣

Unit door closer and latch
摘要:
The unhinged edge of the door has a bolster therealong with its ends extending beyond the top and bottom door edges and provided with means for engaging elements on the header and sill of the door frame for drawing the door to closed position and latching the ends of the bolster thereto.
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