Door control system

Details Door control system Door control system

1980-11-24

1983-03-22

Word, A. Hugo

Tools and hardware

Locking or closing device

D0809

Patent

active

D02683229

REFERENCES:
patent: D120752 (1940-05-01), Gallinger
patent: D214028 (1969-05-01), Weiner
patent: D261099 (1981-10-01), Russell
patent: 2946081 (1960-07-01), Juergens
patent: 3975791 (1976-08-01), Hettich et al.

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