4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

Werner U. Frey

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Contactless keyboard

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

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Electromagnetic relay

Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – With housing or support means
Patent

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Key element for a contactless keyboard

Electricity: circuit makers and breakers – Liquid contact – Time delay
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Key spring

Spring devices – Bendable along flat surface – Bow spring or superposed spring elements
Patent

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Keyboard arrangement

Typewriting machines – Key-board or key lever-actuating mechanism – Key-board including keys grouped to facilitate positioning...
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Profile ID: LFUS-PAI-P-818116

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