World time zone indicator/calculator

Details World time zone indicator/calculator World time zone indicator/calculator

1985-10-09

1988-12-06

Holtje, Nelson C.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10126

Patent

active

D02988372

REFERENCES:
patent: D95205 (1935-04-01), Harrison
patent: D132975 (1942-07-01), Jones
patent: D141710 (1945-06-01), Guttmann
patent: D146500 (1947-03-01), Freel
patent: D195579 (1963-07-01), Ruderian
patent: 2463758 (1949-03-01), Freel
patent: 2525895 (1950-10-01), Graves
patent: 2587615 (1952-03-01), Grega
patent: 4032754 (1977-06-01), Ageton

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