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Class Information
Number: 434/192
Name: Education and demonstration > Mathematics > Arithmetic > Chalkboard or equivalent means having readily erasable surface
Description: Subject matter including a panel having a surface from which marks made by chalk or other means can easily be erased.

Patents under this class:

Patent Number Title Of Patent Date Issued
5769639 Multi-educational device Jun. 23, 1998
5725380 Combination writing board and abacus Mar. 10, 1998
4772208 Apparatus for use in teaching mathematics Sep. 20, 1988
4763291 Remote display device for a microcomputer Aug. 9, 1988
4313727 Educational frame device having a rotatable body and rotatable symbol-bearing inserts Feb. 2, 1982

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