4. Brakes
  5. Internal-resistance motion retarder
  6. Using yieldable or fluent solid or semisolid

Arnold Johansson

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Apparatus for evaluating optical signals

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent

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Azimuth damper

Brakes – Internal-resistance motion retarder – Using yieldable or fluent solid or semisolid
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Optical system

Optics: measuring and testing – Fiducial instruments
Patent

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Profile ID: LFUS-PAI-P-1169487

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