J. Zentmayer Philadelphia

The Grand American model microscopes

monocular: No. 1 and No. 14, binocular: No. 330, and No. 1089

No. 1
No. 14
No. 330
No. 1089

See this article from: Proceedings of the American Microscopical Society. Vol. 14, No. 3, 1893.

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