Permanent series: industry and technology - Germany / Federal Republic of Germany 1982 - 190 Pfennig

Supplementary values ​​to the postage stamp continuous series »industry and technology« introduced in 1975/76. The postage stamps appear at the same time and the same motif with the inscription: "Deutsche Bundespost Berlin". The illustrated hydraulic excavator can be found today on almost every construction site. High performance and diverse application possibilities are characteristic of these machines. The development of these devices began about 20 years ago with small excavators. In the meantime, hydraulic excavators weighing 250 megaponds, 1,000 kW and 14 m³ bucket capacity are in use. These large appliances are used in the mining industry for extraction. The drive system consists of a diesel engine and a power-regulated pump system. Like a continuously variable transmission, power and speed are transformed. A control system provides the desired distribution of power to the work functions. The field of application is extended by a wide variety of grave vessels and other tools. So there are devices that work with very long jibs in subway construction or on a pontoon still at a depth of 20 m. Backhoes were developed especially in Germany. Thus, German products have a special significance on the world market. In particular, the market in the United States is interesting for the large appliances.