4. Measuring, testing, or signalling instruments
  5. Security or signal instrument or casing
  6. Aural, i.e., audible

Theodore Pierson

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Doorbell button

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent

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Doorbell button

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible
Patent

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Doorbell button

Equipment for production – distribution – or transformation of ene – Distribution – modification or control – Switch or casing therefor
Patent

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Doorbell push button

Equipment for production – distribution – or transformation of ene – Distribution – modification or control – Switch or casing therefor
Design Patent

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Profile ID: LFUS-PAI-P-936134

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