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Installation and operation of SGE mercury treadles : catalogue nos. RS.339 and RS.349./

Installation and operation of SGE mercury treadles : catalogue nos. RS.339 and RS.349./ - Wembley : Siemens & General Electric Railway Signal Co., 1952. - 37 p.: fig.; 14 cm.

Subjects--Topical Terms:
Mercury treadles
Electrical circuit

LC Class. No.: SPE-B 1182