Patent classifications
E
FIXED CONSTRUCTIONS
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E05
LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
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E05C
BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
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1/00
Fastening devices with bolts moving rectilinearly
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E05C1/085
With means for assisting depression of the latch bolt during latching
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