ventilating bead

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Mercury switch — A Single Pole, Single Throw (SPST) mercury switch on millimetre graph paper … Wikipedia
TXE — TXE, which stands for Telephone eXchange Electronic, was the designation given to a family of telephone exchanges developed by the British General Post Office (GPO), now BT, designed to replace the ageing Strowger systems. When World War II ended … Wikipedia

Словари и энциклопедии на Академике