Wrist-wearable time teaching instrument

Details Wrist-wearable time teaching instrument Wrist-wearable time teaching instrument

1979-11-02

1981-10-27

Holtje, Nelson C.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D21157, D10 34, D10 7, D1907

Patent

active

D02615320

REFERENCES:
patent: D157580 (1950-03-01), Frampton
patent: D166766 (1952-05-01), Melville
patent: D184951 (1959-04-01), Malsed
patent: D230758 (1974-03-01), Grieder
patent: D243950 (1977-04-01), Ogasawara
patent: D253667 (1979-12-01), Doe
patent: 4015346 (1977-04-01), Ogasawara

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