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Here is a summary of the article on the history and technical achievements of the Cardwell Condenser Corporation:
Company Timeline & Leadership
Early Beginnings (1896–1908): In 1896, Dr. G. A. Cardwell manufactured telegraph components for Western Union. He founded the American Telegraph Typewriter Company in 1907. His stepson, Allen D. Cardwell, joined him in 1907, and the Allen D. Cardwell Manufacturing Company was officially started in Brooklyn, New York, in 1908.
Corporate Moves & Ownership Changes (1944–1959): In 1944, Allen D. Cardwell sold his interest to the Grenby Manufacturing Company, prompting a relocation to Plainville, Connecticut. After a brief ownership by the holding company Chesapeake Industries in the early 1950s, Norman Kjeldsen purchased all of the company's stock on January 16, 1957. In 1959, the company relocated to Lindenhurst, New York.
Expansion through Acquisitions (1964–1980): Cardwell expanded aggressively by absorbing competing capacitor and electronic divisions, including:
1964: National Radio Company's capacitor division, Oak capacitor tooling, and the F. W. Sickles capacitor division.
1967: Telerad Electronic Division (Lionel Corp.), Lieco Inc. (microwave components), and Poly Repro Corporation.
1970: Pickard & Burns, Inc. (submarine antennas and nuclear reactor monitors), originally started by G. W. Pickard.
1971: Hammarlund Capacitor Company, a legendary name in government-use radio receivers and variable capacitors.
1972–1973: Variable air capacitor divisions from Johanson Manufacturing Company and E. F. Johnson.
1980: Multronics, Inc. (air inductors and high-power switches).
1981: By 1981, Cardwell manufactured over 15,000 different items under roughly 25 distinct brand names.
Notable Products & Innovations
Early Products & Wartime Gear: Between 1908 and 1944, Cardwell produced variable air capacitors and telegraph sets, while also installing the New York Stock Exchange's first automatic stock quotation system. During WWII, they developed highly successful test sets (such as the BC221).
Post-War Tech: From 1944 to 1952, Cardwell developed facsimile equipment for United Press International and the globally used GMD meteorological unit for tracking weather balloons.
The Torodyne Circuit (1920s): For a short period in the 1920s, Cardwell manufactured highly sought-after broadcast receivers. Their "Torodyne Circuit" utilized specialized Toro-Tran and Audio-Tran components designed to maximize tube efficiency, nullify tube/stray capacity, and offer synchronous tuning without magnetic feedback.
Signature Capacitors:
Type B (Straight Capacity): Developed in the early 1920s, this design became an all-time industry favorite.
Type E (The Taper Plate): A unique, highly complex "semi-straight wavelength" design that is highly prized by variable capacitor collectors.
