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Troughton & Simms, instrument makers, of London.
1826 Troughton took William Simms, an excellent craftsman and businessman, into partnership; Troughton and Simms manufactured mathematical instruments both large and small, and attracted customers around the world.
The twentieth century brought important changes to Troughton and Simms.
1916 The firm became Troughton and Simms, Ltd.
1963 Became part of the new company, Vickers Instruments, in business until 1988.