Jacket for a combined photo calculator and digital ruler

Details Jacket for a combined photo calculator and digital ruler Jacket for a combined photo calculator and digital ruler

1976-04-05

1978-09-19

Stearman, Joel

Office supplies; artists and teachers materials

Paper or pasteboard for writing or printing

Envelope

D19 26, D1904

Patent

active

D02495317

REFERENCES:
patent: 2303018 (1942-11-01), Bucklin
patent: 2452417 (1948-10-01), Zentis
patent: 3025767 (1962-03-01), Ruffalo
patent: 3467307 (1969-09-01), Levitt

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