Door sign for indicating occupancy

Sales and advertising equipment – Signs or display forms – Attachable to vertical surface or hanging type

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Patent

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D03556794

REFERENCES:
patent: D292245 (1987-10-01), McCormick
patent: D318692 (1991-07-01), Hofman
patent: 3740882 (1973-06-01), Lanphere et al.
patent: 4628624 (1986-12-01), Gunn

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