Elapsed time teaching aid

Details Elapsed time teaching aid Elapsed time teaching aid

1995-03-03

1996-05-07

Word, A. Hugo

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 26

Patent

active

D03696197

REFERENCES:
patent: D43733 (1913-03-01), Buckland
patent: D268686 (1983-04-01), Wolf
patent: D271567 (1983-11-01), Powell
patent: D298609 (1988-11-01), Dawson, Jr.
patent: D346965 (1994-05-01), Wolff
patent: D347656 (1994-06-01), Bumbarger
patent: 2011517 (1935-08-01), Geoffrion
patent: 2255188 (1941-09-01), Rieper
patent: 2816373 (1957-12-01), Caddy
patent: 3608214 (1971-09-01), Rancati
patent: 3803831 (1974-04-01), Horzick
patent: 4368045 (1983-01-01), Kuh

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