Combined message holder and signal

Office supplies; artists and teachers materials – Office equipment not elsewhere specified

Patent

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Details

D10 2, D10 15, D19 75, D1902

Patent

active

D02537737

REFERENCES:
patent: D161840 (1951-02-01), Hopp
patent: D230320 (1974-02-01), Lowery et al.
patent: D233261 (1974-10-01), Magowski
patent: D245765 (1977-09-01), Yoshida

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