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2. SEW Eurodrive - Wikipedia

   en.wikipedia.org/wiki/SEW_Eurodrive

   In 1960, SEW-EURODRIVE opened its first foreign subsidiary—SEW-USOCOME—in Haguenau, Alsace. Between 1968 and 1969, the company began expanding by opening assembly plants in Sweden, Italy, and England. In 1974, the first employees started their work at SEW-EURODRIVE in Canada, which was the beginning of the American expansion of the company.

3. Mercury-arc valve - Wikipedia

   en.wikipedia.org/wiki/Mercury-arc_valve

   Mercury rectifier on display in the Beromünster AM transmitter in Switzerland, before being decommissioned.Three-phase full-wave rectifier with six anodes. A mercury-arc valve or mercury-vapor rectifier or (UK) mercury-arc rectifier [1] [2] is a type of electrical rectifier used for converting high-voltage or high-current alternating current (AC) into direct current (DC).

4. Rectifier - Wikipedia

   en.wikipedia.org/wiki/Rectifier

   The 0Z4 was a gas-filled rectifier tube commonly used in vacuum tube car radios in the 1940s and 1950s. It was a conventional full-wave rectifier tube with two anodes and one cathode, but was unique in that it had no filament (thus the "0" in its type number).

5. Electromagnetic brake - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_brake

   Electromagnetic brakes or EM brakes are used to slow or stop vehicles using electromagnetic force to apply mechanical resistance (friction). They were originally called electro-mechanical brakes but over the years the name changed to "electromagnetic brakes", referring to their actuation method which is generally unrelated to modern electro-mechanical brakes.

6. Mechanical rectifier - Wikipedia

   en.wikipedia.org/wiki/Mechanical_rectifier

   A mechanical rectifier is a device for converting alternating current (AC) to direct current (DC) by means of mechanically operated switches. The best-known type is the commutator , which is an integral part of a DC dynamo , but before solid-state devices became available, independent mechanical rectifiers were used for certain applications.

7. Electro-pneumatic brake system on British railway trains

   en.wikipedia.org/wiki/Electro-pneumatic_brake...

   The first Southern units fitted with EP brake could be considered the Bulleid double deck 4-DDs built 1949 (4001 & 4002). The EP brake fitted to this stock was not of the self lapping type and still required the Westinghouse brake as the 'fail to safe' braking as the EP brake fitted was of the 'energise to apply' type, which meant if there was a loss of brake control voltage the EP brake was ...