4. Radiant energy
  5. Invisible radiant energy responsive electric signalling
  6. With means to inspect passive solid objects

M. Jonell Kerkhoff

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Apparatus for nondestructively determining coating thickness on

Radiant energy – Invisible radiant energy responsive electric signalling – With means to inspect passive solid objects
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Manual assist and method for opening sliding windows and doors

Implements or apparatus for applying pushing or pulling force – Single throw lever – Special engaging feature
Reexamination Certificate

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