Lao kip De La Rue. A 1975 10 kip by Bradbury & Wilkinson and a 1000 kip by De la Rue were printed but not circulated. The Pathet Lao kip was introduced sometime before 1976 in the areas which were under the control of the Pathet Lao. Banknote denominations of 1, 10, 20, 50, 100, 200 and 500 kip were issued. The notes were printed in China. In 1976, the Pathet Lao kip replaced the Royal kip throughout Laos following the Pathet Lao's take over of the country. The exchange rate between the two kip was 1 Pathet Lao kip = 20
Ring main unit type of switchgear is used for medium-voltage power distribution, from 7200 volts to about 36000 volts. The ring main unit was introduced in the United Kingdom and is now widely used in other countries. In North American distribution practice, often the equivalent of a ring main unit is built into a pad-mounted transformer which integrates switches and transformer into a single cabinet. Ring main units can be characterized by their type of insulation, air, oil or gas. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters.