4. Optical: systems and elements
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Edward A. Johnson

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Absorption spectroscopy apparatus and method

Optics: measuring and testing – For light transmission or absorption – Of fluent material
Reexamination Certificate

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Casing volume measuring tape

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent

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Fiber optic reflectance apparatus for in situ...

Optical waveguides – Optical waveguide sensor
Reexamination Certificate

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Gas detection apparatus using a combined infrared source and...

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate

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Gas detection apparatus using a combined infrared source and...

Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Reexamination Certificate

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Profile ID: LFUS-PAI-P-814697

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