4. Geometrical instruments
  5. Area integrators
  6. Electrical

John B. Hennessy

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Animal fat indicator

Geometrical instruments – Area integrators – Electrical
Patent

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Cassette adapter for eight track machines

Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Tape record
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Compasses

Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
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Distance indicating devices

Geometrical instruments – Area integrators – Electrical
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Profile ID: LFUS-PAI-P-644797

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