4. Measuring, testing, or signalling instruments
  5. Security or signal instrument or casing
  6. Alarm or control thereof

Edward A. Butler

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Bicycle alarm

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Alarm or control thereof
Patent

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Door alarm device

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Inclined raked partially submerged propellers

Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Irregular – flanged or channel forming blade surface
Patent

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Profile ID: LFUS-PAI-P-709626

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