I have done a bit of a search and looks like I could be partly wrong.
There was the old silent knight which was a kero/gas fridge, which is not electric. I always assumed they got their name from being silent, due to no compressor.
However, there appears to also be an electric compressor model also, which was called a silent Knight.
Here is a bit from wiki.
The Hallstroms moved to Dee Why, New South Wales, by which time Hallstrom had become interested in the young industry of refrigeration. He set about inventing in his Dee Why backyard, and in 1923 produced his first product, the Icy Ball absorption refrigerator (another kerosene-powered refrigerator, also called the Icy Ball, was later manufactured in the United States in 1927 or 1928 by Powel Crosley Jr.). Hallstrom's Icy Ball was a kerosene-powered chest model, which he designed for use in the Australian outback, where the low-tech Coolgardie safe was in widespread use. He initially went to the outback to sell these units himself.[1]
Hallstrom expanded his product line with the development of the popular Silent Knight upright refrigerator. These were gas-powered and also electric models, and were produced in a factory in Willoughby, New South Wales under the business name of Hallstroms Pty Ltd. During World War II the factory manufactured munitions, as well as refrigerators for the use of the United States Army. By the mid-1940s, the factory was producing around 1,200 refrigerators weekly, which were exported as well as sold locally. The "Hallstrom Silent Knight" was a fairly priced, locally produced product at a time (post-war era) when imported refrigerators were very expensive. Their resulting popularity made Hallstrom a millionaire.[
The full story if you want to read it.
https://en.wikipedia.org/wiki/Edward_Hallstrom



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I've got flywheels, valve plates, reeds, gasket sets, seals and was going to turf them !



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