This type of magneto telephone was made by Stromberg-Carlson (USA) and was initially introduced in 1918. The first version, the 33MW, had a solid back transmitter and a lightning arrestor.
The Commonwealth National Railways also used this model on the Trans-Australia Line which was completed in 1918.
During the 1930's many 33MW were rebuilt in the PMG workshops and fitted with an insert transmitter and a standard receiver. This version was reclassified as the133MW .
During WWII some 33MW and 133MW were rebuilt in the PMG workshops and fitted with a No.164 handset. This version was reclassified as the 233MW.
Source: Substation Equipment Handbook 1951
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