Delft Mechanica
Mechanica C.V. was established in 1937 in Delft, the Netherlands. They initiated business in the metal processing and in 1950 they started to produce motorcycle engines under the brand Sinamec. Shortly hereafter they went through a rapid change and they have specialized themselves in producing parts and equipment to the various kinds of industries: oil & gas, petrochemical and more (based on Mechanica C.V webpage)
Juncker bicycle: see Juncker