GB1058544A
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Thermostat
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GB953666A
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Improvements relating to electric switches
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IE24693L
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Cocks
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GB900767A
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Improvements in or relating to cocks
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GB875446A
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Improvements in or relating to cocks
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GB871064A
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Improvements in or relating to cocks
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ES219256A1
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Improvements introduced in the fountain pens (Machine-translation by Google Translate, not legally binding)
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GB769912A
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Improvements in fountain pens
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GB683587A
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Improvements in or relating to electric heating bottles
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GB722177A
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Improvements in fountain pens
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GB584671A
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Improvements relating to the removal of dissolved salts and other non-volatile substances from liquids
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GB437669A
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Improvements in or relating to conversion of alternating currents
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GB437366A
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Improvements in electrical direct current systems
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US2031582A
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Conversion of alternating currents into direct current or vice versa
|
US2029212A
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Electrical direct current system
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GB433277A
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Improvements in commutators
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IE13363L
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Electrical transformation system
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GB418436A
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Improvements in or relating to electrical conversion or transformation systems
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US2021164A
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Electric rotary machine system
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GB392950A
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Improvements in or relating to direct current commutator electric machines
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