Lamp Hour
Hawkins' Electrical Dictionary · 1915 · p. 3
—A unit of electric light service, equal to the currents required for one lamp during one hour.
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Lamp-hour
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The Standart Electrical Dictionary (1892)
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Adair's New Encyclopedia (1923)
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A Concise Anglo-Saxon Dictionary (1916)
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Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
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Webster's Condensed Dictionary- A Condensed Dictionary of the English Language (1909)
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Chamber's Twientieth Century Dictionary (1908)
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Chamber's Twientieth Century Dictionary (1908)
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Pears Shilling Cyclopedia (1898)
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Chandler's Encyclopedia (1898)
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Chamber's Etymological of the English Language (1895)
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An Illustrated Encyclopedic Medical Dictionary (1893)
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Illustrated Marine Encyclopedia (1890)
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A Dictionary of Islam (1885)
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Webster's Practical Dictionary- A Practical Dictionary of the Englih Language (1884)
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Zell's Condensed Dictionary (1879)
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