Dettmer and Betts
 The name Dettmer comes from Germany
These two names were once both associated with the making of musical instruments, and were united through marriage in 1797.
George Dettmer1740 - 1833. Head of the Pianoforte making firm.  Probably born in Germany.
William Dettmer Son of George, born 1760 London. Piano maker.  He designed and patented parts of pianos. His firm was well known until recently. Migrated to N.S.W. in Julindur in 1849 , and he opened a branch in Sydney. Died Sydney 1856.
 Married Mary Betts (6 Feb 1797) and Phillis Betts (29 Nov 1809)
William Gottleip Dettmer born 8 December 1797; baptized 14 Jan 1798, St Pancras, London. 
Caroline Dettmer born 1806, married (1)  John Ashton Green 29 Sept 1823 in Westminster 
                               (2)  Christopher W. May 15 June 1839 in Sydney, N.S.W. 
died Windsor, N.S.W.  16 June 1877
Elizabeth Dettmer born St Pancras 1803; married Dr John Jackson . Died in London, 1845.  Four children (see Jackson).

John Edward BettsLuthier - i.e. maker of violins and other stringed instruments.
1752 - 1823. Born in Stamford, Lincolnshire. His father was a farmer named Edward Betts.
He was apprenticed to the firm of Richard Duke, and eventually bought the firm.
He married Rebecca Beard on 26 September 1771.  
Daughters Mary Betts (b. 1774) and (probably) Phillis Betts. (See above.)

See page of London churches visited by the Dettmers. See a page of Dettmer pianos. The Dettmer name continues in London.
email me on bill@kellaway.info
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