Baskets of dusty and clean chalboard erasers demonstrate the Chalkdust cleaner invention.

Date
1903-08
Language
American English
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Indiana State Board of Health
Abstract

[Chalkboard erasers before and after, using Chalk dust cleaner]

Description
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Cite As
Indiana State Board of Health. Monthly Bulletin. 1903; 5(8) :90.
ISSN
0019-6754
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Page 90, lower left approximately 5 X 2 in.
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Although these works may be freely accessible on the World Wide Web and may not include any statement about copyright, the U.S. Copyright Act nevertheless provides that such works are protected by copyright. Users must assume that works are protected by copyright until they learn otherwise.
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Monthly Bulletin
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still image b&w photograph
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