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The Oesper Collections in the History of Chemistry, University of Cincinnati
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Commercial valence block models for use in the lecture hall based on a peg and hole locking mechanism and interchangeable cardboard labels.
Commercial valence block models for use in the lecture hall based on a peg and hole locking mechanism and interchangeable cardboard labels.

Issue 56 describes an unusual type of chemical model known as a valence block that was once used to teach introductory chemistry and which also appeared in chemistry sets in the period 1940-1960.

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