Blackboard eraser

Details Blackboard eraser Blackboard eraser

1994-09-09

1996-01-30

Thompson, Martie

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Eraser

D 4137

Patent

active

D03666700

REFERENCES:
patent: D131293 (1942-02-01), Barnes et al.
patent: D152146 (1948-12-01), Eldridge
patent: 3618153 (1971-11-01), Coult
patent: 4462134 (1984-07-01), Wang
patent: 4742594 (1988-05-01), Chen
patent: 4941225 (1990-07-01), Liao

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