Panel switch

The Panel switching system was an early type of automatic telephone exchange for primarily urban service, first introduced in the Bell System in the 1920s and replaced by modern systems during the 1970s. It was developed by Western Electric Labs, later called Bell Labs, in the U.S. in parallel with the Rotary system at International Western Electric in Belgium before World War I which was used in Europe. Both systems had many features in common.

单词	Panel Switch
释义	Panel Switch 英语百科 Panel switch The Panel switching system was an early type of automatic telephone exchange for primarily urban service, first introduced in the Bell System in the 1920s and replaced by modern systems during the 1970s. It was developed by Western Electric Labs, later called Bell Labs, in the U.S. in parallel with the Rotary system at International Western Electric in Belgium before World War I which was used in Europe. Both systems had many features in common.
随便看	sodium compounds or potassium compounds with amines and carbon dioxide的意思 sodium conductance的意思 sodium contaminants的意思 sodium content的意思 sodium coolant的意思 sodium coolant system的意思 sodiumcooled的意思 sodium cooled breeder reactor的意思 sodium cooled decay store的意思 sodium cooled fast breeder reactor的意思 Sodium cooled fast reactor的意思 sodium cooled reactor的意思 sodium cooled thermal reactor的意思 sodium cooled valve的意思 sodium cooled valves的意思 sodium cooling的意思 sodium copper的意思 sodium copper chlorophyll的意思 sodium copper chlorophyllin的意思 Sodium Copper Chlorophyllin Tablets的意思 sodium copper cyanide的意思 sodium copper edetate的意思 sodium copper phosphate的意思 sodium coulomb meter的意思 sodium coupled transport mechanism的意思

Panel Switch

Panel switch