[Counting chamber with Zappert-Neubauer ruling] [realia] : 6456.

ArchivalResource

[Counting chamber with Zappert-Neubauer ruling] [realia] : 6456.

1 counting chamber : glass ; 7.5 x 3.3 x .3 cm.

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Bausch & Lomb Optical Company

http://n2t.net/ark:/99166/w6hb3nv4 (corporateBody)