Luminescent door knob indicator

Details Luminescent door knob indicator Luminescent door knob indicator

1993-01-08

1994-04-26

Bullock, B. J.

Sales and advertising equipment

Signs or display forms

Attachable to vertical surface or hanging type

D 8351, D21173, D21190

Patent

active

D03464067

REFERENCES:
patent: D110867 (1938-08-01), Kidd
patent: D166881 (1952-05-01), Russell
patent: D213270 (1969-01-01), Wormser
patent: D225609 (1972-12-01), Corbett
patent: D243925 (1977-04-01), Creamer
patent: 2712582 (1955-07-01), Peretti
patent: 4422852 (1983-12-01), Mathias

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