4. Optics: measuring and testing
  5. Refraction testing
  6. Prism engaging specimen

Frederick Lee Williams

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Method and apparatus for measurement of optical detector...

Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate

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Method and apparatus for measuring the sum of the radii of parti

Optics: measuring and testing – Refraction testing – Prism engaging specimen
Patent

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