That is a Cdn number which was replaced by a US part number of 2920-00-671-4551 (obsolete in Canada). The reference is that it's a distributor applicable to a compressor, rotary, 250CFM which would seem to tie in with what Bob was talking about..
Little wonder I had never seen one....I wasn't born when they were in service. Thankfully we have more seasoned veterans like Bob to have seen these.
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