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François Calla (1802-1884) was a French engineer, the son of Etienne Calla.
1835 François took over management of his father's machinery and foundry business.
He admired the machine tools of Nasmyth, Sharp, and Whitworth, and introduced Whitworth's gauges to France. According to Jules Gaudry, Calla visted Manchester, and met Joseph Whitworth, who accused him of copying his machines. Calla responded that 'wishing to do a good job, I found no way of doing differently from you'. They became friends, and Calla represented Whitworth's interests in France.
c.1849 Transferred his workshops to La Chapelle.
The above information is condensed from 'A History of Technology and Invention - Progress through the Ages'