Blackboard rubber made of, or including, metal

Details Blackboard rubber made of, or including, metal Blackboard rubber made of, or including, metal

1985-12-27

1987-10-06

Thomas, Alexander S.

Brushing, scrubbing, and general cleaning

Implements

Eraser

15223, 428900, 428 99, B43L 1904

Patent

active

046973010

ABSTRACT:
Blackboard rubber made of metal or having a metal base made up of two parts enclosed one within the other, the first part being in the form of a rectangular box and the second part being flat and forming a lid to the first part; the said second part comprises a centered metal plate and a magnet and is covered with a detachable rubbing sheet of soft material.

REFERENCES:
patent: 3110917 (1963-11-01), McPeek

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