| Country of Origin | United States |
|---|
Check the listing for details. CHEMICAL CALCULATOR CARDBOARD DISC. Condition: Used, Made in United States. Listed at 28.00 USD. Cambosco Chemical Formulator, copyright 1940, two discs pinned together, four windows in smaller disc, in Mylar protective sleeve, Cambosco Scientific Company, Boston Mass., with international table of atomic weights on rear. Seven-inch diameter. Nice old piece.
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