This ruler probably came to the American Philosophical Society Library--where I worked for 17 years--from one of those companies that makes products for institutions to use as promotional pieces or gifts to donors. So it's a promotional piece for a promotional piece! Chances are very good that the APS chose not to use the services of this company, and I'm glad to have this ruler in my collection.
Gift - Martin L. Levitt - 9/28/1995
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