Spencer bright-line counting chamber with improved Neubauer ruling [realia] : 79.22.36.1 / designed by Harry G. Ott.
Related Entities
There are 2 Entities related to this resource.
Spencer Lens Company
http://n2t.net/ark:/99166/w68966zq (corporateBody)
Ott, Harry G.
http://n2t.net/ark:/99166/w6pk3c3x (person)