Dubilier Condenser & Radio Corporation
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Product Details
CompanyDubilier Condenser & Radio Corporation
Certificate Type
Common/Preferred Stock
Date Issued
Unissued, circa 1920's
Canceled
Yes
Printer
Hamilton Bank Note Company
Signatures
NA
Approximate Size
12" (w) by 8" (h)
Images
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Guaranteed Authentic
Yes
Additional Details
NA
Historical Context
The Dubilier Condenser Company was the earliest commercial manufacturer of electronic capacitors (formerly known as condensers) which were widely used in early radio receivers (wireless sets.)
The company was founded in New York in 1920 by William Dubilier, who was responsible for many early developments in the field of electronics and radio, including the use of mica in capacitors. Dubilier was a name commonly found on capacitors in early wireless sets in Britain alongside TCC, Wima and others.
The company later changed its name to the Dubilier Condenser & Radio Corporation and merged with Cornell Radio to form Cornell-Dubilier in 1933.
William Dubilier demonstrated radio communication at Seattle's Alaska–Yukon–Pacific Exposition on June 21, 1909; ten years before the first commercial station operated. A graduate of Cooper Union, he was the first to use sheets of naturally occurring mica as the dielectric in a capacitor. Mica capacitors were widely used in early radio oscillator and tuning circuits because the temperature coefficient of expansion of mica was low, resulting in very stable capacitance – mica capacitors are still used where exceptional temperature stability is needed.
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