Lever adapter for door knobs

Tools and hardware – Handle – knob or pull – Element or attachment

Patent

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Details

D 8308

Patent

active

D02956055

REFERENCES:
patent: D219861 (1971-02-01), Coffman
patent: D268984 (1983-05-01), Bergen
patent: 2801122 (1957-07-01), Sutter
patent: 2942909 (1960-06-01), Chase
patent: 3575453 (1971-04-01), Hohl
patent: 3827739 (1974-08-01), Overholser
patent: 4223931 (1980-09-01), Neary
patent: 4285536 (1981-08-01), McCoy et al.

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