4. Typewriting machines
  5. Key-board or key lever-actuating mechanism
  6. Including means generating a signal for type selecting or...

Robert P. Fisher

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Keyboard switch

Typewriting machines – Key-board or key lever-actuating mechanism – Including means generating a signal for type selecting or...
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Method for generating chlorine dioxide gas

Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
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Photochemical method for generating chlorine dioxide gas

Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
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