4. Metal working
  5. Piezoelectric device making

Fred Johannsen

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Keyboard employing photoelectric key actuation sensing

Typewriting machines – Key-board or key lever-actuating mechanism – Including means generating a signal for type selecting or...
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Method of producing an etched base plate for an ink print head

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making named article
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Method of providing an ink jet printing head with piezo-crystals

Metal working – Piezoelectric device making
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Profile ID: LFUS-PAI-P-662036

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