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Bertram Charles Joy (c1876-1953) of Simms Motor Units
of Ulster Chambers, 168 Regent Street, London, W.1
c1876 Born the son of David Joy
1881 Living in Anerley Road, Penge: David Joy (age 56 born Leeds), Consulting Engineer. With his wife Kate Joy (age 34 born Watford) and their five children; Edith D. Joy (age 11 born Saltburn); Lilian C. Joy (age 8 born Redcar?); Norman H. Joy (age 6 born Harrow, Lancs.); Bertram Charles Joy (age 5 born Harrow, Lancs.); and Kathleen Joy (age 1 born Harrow, Lancs.). Four servants.
1911 Living at 24 Inglewood Road, West Hampstead: Kate Joy (age 64 born Watford), Widow. With her son Bertram Charles Joy (age 35 born Barrow-in-Furness), Consulting Engineer - Mechanical Engineer. One servant.
1927 of 55 Yale Court, Honeybourne Road, West Hampstead, N.W.6. Telephone number is Hampstead 8308. (1927)
1953 Obituary 
WE regret to record the death of Mr. Bertram Charles Joy, M.I.Mech.E., of Bank House, Montgomery, which occurred on Friday, March 20th.
He was seventy-seven, and throughout the whole of his professional career was associated with the British automobile engineering industry.
Bertram Joy was the second son of the late David Joy, and was educated at Aldenham School and at University College, London. After a period of practical engineering under his father, he joined the Simms Manufacturing Company in 1896, and for eleven years or so was engaged on motor-car and engine design.
Mr. Joy then started up in practice as a consultant, in which work he continued until the early 1930s, apart from a period of eighteen months or so in the first world war when he served as chief draughtsman to the Associated Equipment Company, Ltd.
When he relinquished his consulting work, Mr. Joy joined Simms Motor Units, Ltd., his principal responsibility being experimental and development work on car and engine accessories. There are several inventions to his credit, including gas and vacuum pumps, a diaphragm fuel pump and a magnetic oil filter.