Postage stamp: industry and technology - Germany / Federal Republic of Germany 1979 - 150 Pfennig

Supplementary values ​​to the postage stamp continuous series »Industrie und Technik« introduced in 1975/76. The values ​​for 150 Pf and 180 Pf appear at the same time and the same motif as the inscription Deutsche Bundespost Berlin. The postage stamp shows a hydraulic excavator, a device that can be found today on every construction site. High performance, wide range of applications distinguish these machines. The development of these devices began about 20 years ago with small devices. In the meantime, hydraulic excavators weighing 250 Mp, 1,000 kW and 14m3 bucket capacity are in use. These large appliances are used as mining equipment in the mining industry. The drive system consists of a diesel engine and a power-regulated pump system. According to a continuously variable transmission power and speed are converted. A control system provides the desired distribution of power to the work functions. The application area is extended by a wide range of grave vessels and other tools. So there are devices that work with very long facilities in subway construction or on a pontoon still at a depth of 20 m. The technology of these devices was developed and promoted especially in Germany. Accordingly, our products have corresponding weight in the world market. In particular, the US market is interesting for the big devices.