In the 1950s, Kämper began working with the German company DEMAG to manufacture hydraulic products, pumps and valves.

In the 1960s, the American company Bellows Valvair extended its production to focus on successful and innovative axial piston pumps.

In 1973 the Swedish company VOLVO took over the company and with the V30B and V30D set new standards for reliability and service life.

In the context of the merger between VOLVO and Atlas Copco, the Berlin company also began supplying its products under the new label VOAC.

Founded in 1993 by MbO, InLine continues with the product range on its own from this point and still uses the existing sales channels.

Following the takeover of VOAC by Parker, axial piston pumps made in Berlin under the new label also become an important part in the product range of the new partner.

In 1999, HAWE Hydraulik from Munich takes over the company and immediately begins to expand the product range to include the typical V60N and V30E mobile pumps.

In 2015, HAWE and Hengli establish worldwide cooperation, under which Hengli takes over management of production in Berlin.