Betz Hospital special 1 minute [thermometer] [realia] : 73.5.43e, 73.5.43f.
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Frank S. Betz Company
http://n2t.net/ark:/99166/w6np70h0 (corporateBody)
Chicago, IL. From the description of Collection, ca.1896-1930. (College of Physicians of Philadelphia). WorldCat record id: 122632892 ...