Well this all proved to be an interesting trip down Memory Lane. Thank you all for your posts.
Robbins & Myers were certainly an amazing company and they seem to have had a long connection with Marconi, right back to Mr. Marconi himself, so the fact they built the Rotary Transformers used in the Wireless Set No. 52, is now no great surprise.
It was also nice to learn that their original wartime factory in Brantford, was still standing a few years ago.
On the sad side, however, nothing remains of the company now as far as any possible central archive source is concerned, but a number of sites on the web are trying very hard to reconstruct relevant information. The company did maintain an office in Calgary serving the petroleum industry but as of a few years ago, that office was down to just 3 employees and are now no longer listed. But their household fan division is still alive and well under the Hunter name.
Oh well. Thanks for the help everyone. Best hope the brushes in the two Rotary Transformers are all present and in good shape.
David
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