From this crude apparatus—the first incandescent lamp—conceived and constructed by Edison only fifty years ago, has evolved the modern electric lamp.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311030.2.6.2
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Radio Record, Volume V, Issue 16, 30 October 1931, Page 3
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21From this crude apparatus—the first incandescent lamp—conceived and constructed by Edison only fifty years ago, has evolved the modern electric lamp. Radio Record, Volume V, Issue 16, 30 October 1931, Page 3
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