4. Measuring, testing, or signalling instruments
  5. Measuring, regulating or indicating instrument, or casing
  6. Electrical property

Frederick W. Schwartz

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Battery tester

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
Patent

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Battery testing system

Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent

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Portable alarm

Communications: electrical – Condition responsive indicating system – Specific condition
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Profile ID: LFUS-PAI-P-1010278

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