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Filament Lamps
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/light-bulb-on-table-studio-shoot--space-for-copy--948444796-d43494f261a34d1495ca4f1b5ee498f1.jpg "Light Bulb Letter and Number Codes")
Light Bulb Letter and Number Codes
Electric Lamp: The Thomas A. Edison Papers at Rutgers University
filament lamp | electronic device | Britannica
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