Dial for world time zones

Details Dial for world time zones Dial for world time zones

1987-12-21

1990-12-18

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Patent

active

D03130436

REFERENCES:
patent: D84574 (1931-07-01), Engl et al.
patent: 1959831 (1934-05-01), Krzeminski
patent: 2056089 (1936-09-01), Boggs
patent: 2399902 (1946-05-01), Wood
patent: 2513465 (1950-07-01), Fisk
patent: 3002337 (1957-08-01), Smith
patent: 3091915 (1960-04-01), Pawl
patent: 3232038 (1966-02-01), Smith
patent: 4502789 (1985-03-01), Heath
Beckley-Cardy Company Catalog, 1959-1960, p. 77, "World Time Dial", bottom left of page.

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