Officine Meccaniche Gallaratesi S.p.A was established in 1907 by a group of Milanese entrepreneurs. The company's main activity during its early years was centred around an engineering workshop and its annexed cast iron foundry and aimed at satisfying the increasing demands of the rapidly expanding Lombardy industry at the start of the century. During following years, the company added the construction of machines to its production, in particular positive-displacement pumps and compressors. The first patent for a hollow disc rotary pump was registered in 1918. The principle patented at the time is being used in a series of pumps still in production. The 1950's saw the design and production of the first plunger dosing pumps. The range of dosing pumps has since been expanded with the introduction of a number of diaphragm dosing pumps during the 70's. During the 1980's, OMG initiated the introduction of a formalised quality system, with the first complete quality system being adopted in 1992