Changeable sign

Details Changeable sign Changeable sign

1985-08-08

1988-04-12

Kemper, Catherine E.

Sales and advertising equipment

Signs or display forms

D20 21

Patent

active

D02951932

REFERENCES:
patent: D115561 (1939-07-01), Lee
patent: D227599 (1973-07-01), Wisgin
patent: D275969 (1984-10-01), Bowers

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