Chalk eraser cleaner

Details Chalk eraser cleaner Chalk eraser cleaner

1988-03-17

1991-07-16

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

D19 53

Patent

active

D03182967

REFERENCES:
patent: 378608 (1888-02-01), McClung
patent: 846681 (1907-03-01), Meyer
patent: 1619899 (1927-03-01), Ward
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patent: 3262144 (1966-07-01), Avila
patent: 3395413 (1968-08-01), Dalton
patent: 3805312 (1974-04-01), Wu
patent: 4099286 (1978-07-01), Ishikawa
patent: 4549327 (1985-10-01), Johnson

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