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Struthers-Dunn LLC, formally known as Struthers-Dunn or Dunco, is a manufacturer of industrial controls since 1923. Struthers-Dunn was founded by John Struthers-Dunn in 1923 outside Philadelphia, Pennsylvania. They were one of the earliest relay manufacturers in the United States and became the first manufacturer of Military Relays for US Government during World War II. Their first military product, the 101 Series contactor was a 100A rated SPST switch for use on Naval Ships in 1938. Subsequent development led to the beginning of the QPL (Qualified Product List) of products for the US Military, commonly known as MIL-SPEC Products today. On the Commercial Products side, their other notable design was the 219 Series of Industrial Relays. Originally designed as a socket-compatible, high-reliability relay for use in Nuclear Energy Facilities, it is still used today for critical controls. The 219 packaged family of products, and the 219NE (Nuclear Energy) family, encompassed in addition to the standard electro-mechanical versions - the 236/237/238 family of industrial time-delay relays, the later 246/247/248 family of advanced time-delay relays, the 255 Series of latching relays, the 311 Series of Sequence/stepper relays, the 349 Series Voltage Sensors and the RSX Series of custom packages controls. ==Company history== * 1923 - Company is founded by John Struthers-Dunn in Philadelphia, PA.〔(【引用サイトリンク】 url = http://www.struthers-dunn.com/content/view/53/30/ )〕 * 1926 - John Struthers-Dunn submit and is awarded a patent for his SPDT, self-adjusting relay, the first use of many standard features still used in the design of electro-mechanical relays today.〔(【引用サイトリンク】 url = http://patents1.ic.gc.ca/details?patent_number=258482/ )〕 * 1938 - Introduces the first relay approved for US Military Applications - the 101 Series, used on Naval Vessels. * 1946 - Charles Packard, Chief Engineer and Struthers-Dunn publish "Relay Engineering" one of the earliest relay textbooks written.〔(【引用サイトリンク】 publisher = Published by Struthers-Dunn, Inc - 1945 )〕 * 1947 - Becomes a founding members of NARM, The National Association of Relay Manufacturers.〔(【引用サイトリンク】 url = http://www.ec-central.org/RSIA/History.htm )〕 * 1954 - Company moves to new headquarters in Pitman, NJ. * 1958 - Introduces the 219 and 219NE Series approved for use by the AEC (Atomic Energy Commission) in Nuclear Power Plants. * 1986 - Nytronics Corporation purchases Struthers-Dunn and moves company to new facility in Darlington, SC. * 1990 - Magnecraft Electric Company (Chicago, IL) purchases the Struthers-Dunn Commercial Product Lines from the Nytronics Corporation. The two companies are reorganized as MSD, Inc (Magnecraft & Struthers-Dunn) with headquarters in Chicago and primary operations in Darlington, SC. * 1995 - MSD Inc purchases the Military Product Line (MIL-SPEC QPL Products) from the Nytronics Corporation. * 2003 - MSD sells the Military Product Line to Tyco Electronics for an exchange of cash and Commercial Relay product lines. * 2005 - MSD sells the Magnecraft Commercial Product Lines to Schneider Electric.〔(【引用サイトリンク】 url = http://www.companynewsgroup.com/communique.asp?co_id=96524 )〕 The Struthers-Dunn commercial products are sold to Eric Steinback, former Director of Sales of MSD. Company is reformed as Struthers-Dunn LLC, a premier supplier of custom built industrial controls. Struthers-Dunn is one of a few privately owned relay companies left in the United States. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Struthers-Dunn」の詳細全文を読む スポンサード リンク
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