4. Communications: electrical
  5. Condition responsive indicating system
  6. Specified indicator structure

Daniel R. Valentine

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Alarm apparatus for detecting disturbance or other change of con

Communications: electrical – Condition responsive indicating system – Specified indicator structure
Patent

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Noncontact shaft angle detector

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Tamper-proof identification card and identification system

Printed matter – Having revealable concealed information – fraud preventer or... – Utilizing superposed layers
Patent

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Profile ID: LFUS-PAI-P-1448603

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