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GB191418116A
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Improvements in and relating to Audible Alarms and Signalling Apparatus.
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GB191404747A
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Improvements in and relating to Diaphragm Horns.
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GB191400816A
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An Improved Method of Operating or Actuating Audible Alarms.
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GB191328059A
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Improvements in Electric and Vibratory Horns or Alarms and Methods of Operating same.
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GB191327780A
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Improvements in Striking and Operating Mechanism for Audible Alarms.
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GB191306820A
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Improvements in Diaphragm and like Horns for Signalling and other purposes.
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CA109079A
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Speed indicator
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GB190628406A
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Improvements in Plates for Secondary and Storage Cells.
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US877711A
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Instrument for indicating speeds, distances covered, and the like.
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GB190524413A
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Improvements in Instruments for Indicating Speeds and Distances Covered
|
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GB190410136A
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An Improved Contact Breaker or Interrupter for Internal-combustion Engines.
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