Doorknob

Details Doorknob Doorknob

1993-12-30

1996-05-14

Bullock, B. J.

Tools and hardware

Handle, knob or pull

Simulative

D 2900, D 2902

Patent

active

D03697363

REFERENCES:
patent: D131315 (1942-02-01), Zimm
patent: D259522 (1981-06-01), Bidegain
patent: D318715 (1991-07-01), Hardman
patent: D326350 (1992-05-01), Silverman et al.
patent: D334275 (1993-03-01), Miller et al.
patent: 3604741 (1971-09-01), Steere
patent: 3949125 (1976-04-01), Roberts
patent: 4773684 (1988-09-01), Dieckmann et al.
patent: 5049342 (1991-09-01), Scanlon et al.

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