33S1 is not a model number.
33S1 is the UL Listing for Ives (and formerly Glynn-Johnson) Bar Coordinators (COR32, COR42, COR52, COR60, and COR72) and on the Gravity Coordinators (COR7g and COR9G).
This is sometimes misread as 3351 instead of 33S1.
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