PH12562A
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Record card system
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GB1428355A
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Record card systems
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GB463673A
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Improved platen-raising mechanism for typewriters
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GB420001A
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Improvements in or relating to clocks or like dial and pointer indicators
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GB422293A
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Improvements in or relating to recording apparatus
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GB392148A
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Improvements in or relating to control devices for turnstiles and the like
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DE570017C
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Electric clock system
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DE569002C
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Electric clock system
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GB352207A
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Improvements in or relating to synchronized clock systems and secondary clocks therefor
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US1798583A
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Time stamp
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DE567726C
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Device for synchronizing electrical clock systems
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US1878931A
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Master clock
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US1835386A
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Battery charging device
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US1908112A
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Synchronizing clock control system
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US1887221A
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Synchronized clock system and secondary clocks therefor
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US1817490A
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Synchronizing mechanism for secondary clocks
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US1830762A
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Secondary clock
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US1812628A
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Automatic battery charging system
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US1821100A
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Oscillating armature secondary clock
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US1791761A
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Paper clamp for dial recorders
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