1. 1
   A third of a century of De Zeng instrumentation : an account of the scientific and mechanical contributions of Henry L. DeZeng to the domain of eye, ear, nose and throat diagnostic...

   gan Sheard, Charles, 1883-
   Cyhoeddwyd 1923

   Camden, N.J. : De Zeng Standard Co. , [c1923]

   1 online resource (47 p.) : ill.

   Pynciau: “...Medical instruments and apparatus....”
   

   Local Call Number: Llwytho...
   

   Center for Research Libraries
   

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   Ychwanegu at ffefrynnau
   

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2. 2
   To all people to whom these presents shall come, Greeting : Whereas I, Elisha Perkins, of Plainfield, in the state of Connecticut, have ... obtained a patent in the form following...

   gan Perkins, Elisha, 1741-1799
   Cyhoeddwyd 1796

   [Philadelphia?] : [publisher not identified], [1796?]

   1 online resource (1 sheet)

   Pynciau: “...Medical instruments and apparatus....”
   

   Local Call Number: Llwytho...
   

   LLMC Digital
   

   Mynediad Ar-lein

   Ychwanegu at ffefrynnau
   

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