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The Telharmonium (also known as the Dynamophone [1]) was an early electrical organ, developed by Thaddeus Cahill c. 1896 and patented in 1897. [ 2 ] [ 3 ] [ 4 ] The electrical signal from the Telharmonium was transmitted over wires; it was heard on the receiving end by means of " horn " speakers.
Keithley Instruments bench-top digital multimeter. Keithley Instruments is a measurement and instrument company headquartered in Solon, Ohio, that develops, manufactures, markets, and sells data acquisition products, as well as complete systems for high-volume production and assembly testing.
Hammond Organ Company – Chicago, Illinois; Lowrey Organ Company – Chicago, Illinois; Marshall & Ogletree – Needham, Massachusetts; Rodgers Instruments – Hillsboro, Oregon (owned by parent company Vandeweerd in Netherland, owner of Johannus) Thomas Organ Company; Walker Technical Company - Center Valley, Pennsylvania
EICO was established in New York City in 1945 by radio repair business owner Harry Ashley to manufacture electronic test equipment in kit form. His first product, advertised in the July 1946 Radio News, was the model 113 VTVM/audible signal tracer. [ 1 ]
Sheller-Globe Corporation was a U.S. auto parts manufacturer and industrial conglomerate based in Toledo, Ohio.Formed in 1966 on a heritage of much older companies, Sheller-Globe grew through the acquisition (and divestiture) of many other businesses before it was acquired by United Technologies Corporation in 1989.
Richard I. Berger (born 1952) is the president. Before becoming president, he had overseen the Trophy Grover Company and Grossman Musical Products, which in 1983, was one of the largest distributors of musical instruments in the U.S. Grossman Musical Products was founded in 1922 by his great uncle, Henry Saul Grossman (1898–1995) [5] who, from 1953 to 1966, owned Rogers Drums.
TransDigm was formed in 1993 [2] under the name TD Holding Corporation. [3] It was founded with an initial equity investment of $10 million. [4]: 228 The company was created by founders W. Nicholas Howley and Douglas Peacock, along with private equity firm Kelso & Company, in order to acquire and consolidate four industrial aerospace companies from IMO Industries Inc. in a leveraged buyout.
Thaddeus Cahill (June 18, 1867 – April 12, 1934) was a prominent american inventor of the early 20th century. He is widely credited with the invention of the first electromechanical musical instrument, which he dubbed the telharmonium.