Welcome and congrats on your purchase of the G-E model CS17 floor polisher.
Here's some background along with details of your model. Going by advertising, Canadian G-E introduced its first floor polisher in 1949 and marketed the line for about 25 years, while the US G-E's contemporaneous line began 8 years later and only lasted half the time. Some of them had the same hood design as yours but in different colors and were ID'd with the FP prefix. At least one other country, Australia, also used the CS prefix ID for its floor polishers; but different numbers. The one I located was for the model CS20.
Marketers choose their words carefully, so while I would presume that 'CS' meant 'circular scrubber', 'floor polisher', the term used in ads, de-emphasizes the work and promotes the result. It must have been advantageous for Canada and other international G-E subsidiaries to use their own model prefix apart from the one used in the US.
I located newspaper ads for the CS17 from 1961 to 1963, and it was the MOL model in "the lovely maroon finish"that included a pair of lamb's wool pads. The Deluxe CS-16 had a metallic hood finish or a chrome option and was fully accessorized, while the BOL CS-18 with a simplified hood design in Horizon Blue came with only the felt buffing pads and brushes according to ads. Both hood designs succeeded the original in 1961.
The model CS28 was introduced in 1964 featuring a cord reel and a chrome hood along with the standard model CS21, the Sherwood CO-OP model CS22 and the B F Goodrich model CS29. The CS21 was the last I saw advertised as a clearance item in 1975.
Enjoy the attached ads and using your vintage twin brush polisher.