![]() Its products were sold through trade fairs. The company then had skilled workers instead of children and war invalids, but many of them had to work at home because the company's rooms were not sufficient. In the 1840s it started to make modern spectacles with steel frames. When his son Eduard (1797-1878) took over the company in 1819 it had begun to make auricular tubes. Duncker gave glasses for free to poor people. The first products were spectacles which were sold through specialised shops instead of by house-to-house salesmen. With low wages and piece-work he could produce cheaply. He disassembled it and made his own grinding machine from the parts. From a bankrupt optical plant in Neuruppin he bought a big multiple-lens grinding machine. He employed orphaned children and war invalids in his Optische Industrie-Anstalt. In 1801 he got permission from the Prussian King to extend his business to industrial dimensions. In 1792 the pastor Johann Heinrich August Duncker (1767-1843) of Rathenow began to make optical instruments and sold them in Germany. The F:4.5 Omnar, the remarkable Bis-Telar F:7 telephoto lens, the fast Glaukar F:3.1 Anastigmat and the Preis-Kamera (9x12 or 10x15). was a camera and lens maker in Rathenow, Germany.
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