4. Metal working
  5. Piezoelectric device making

TDK Corporation

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180 degrees hybrid coupler

Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate

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180 degrees hybrid coupler

Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate

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3-phase input type of switching power circuit

Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent

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8mm video tape cassette

Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Cartridge system
Patent

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A pit-forming optical recording media and process for producing

Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Radiation sensitive composition or product or process of making
Patent

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