Mortar and Pestle

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  Dentist Chair

  2 patents – 1 for the design of chair, 1 for the cup holder for spittoon.

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  Bausch and Lomb Microscope

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  Bausch and Lomb Microscope

  First Bausch & Lomb microscope. Both witnessed the patent document. Print includes these signatures.

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  Phrenology

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  Phrenology

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  Phoropter

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  Phoropter (for eye testing)

  Invented by Henry DeZeng, who also trademarked the word Phoropter – a word that is now used for visual testers.

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  Xray Tube

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  Xray Tube

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  Blood Pressure Manometer

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  Blood Pressure Manometer

  2 patents – construction improvement for less breakage and better accuracy, second has a mercury reservoir and glass measuring tube.

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  Infant Incubator

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  Bunsen Burner

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  Bunsen Burner

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  Aspirin

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  Aspirin

  Felix Hoffman's patent on his refinement of the formulation that Charles Frederic Gerhardt tried but gave up on.

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  Ophthalmoscope

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  Ophthalmoscope (for examining eyes)

  2 patents – 1 one for a new and improved version, 1 for a battery dry handle.

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  Stethoscope

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  Stethoscope

  First USA patent on the stethoscope – for a concealed noiseless spring that eliminated vibrations.

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