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Eureka Heavy Duty Commercial brochure from 1993.
Models shown: C2031, C2032, C2094 and C4046.

The equivalent Sanitaire red line uprights would be, respectively: model SC886, SC887, SC888 and SC899.

Sanitaire blue line versions, respectively: model S646 (no dirt cup equivalent), S648 and S678.

~Ben

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Here's the back side of the same brochure.

~Ben

 

I found what is pictured here as C2094 in a thrift store in Colorado Springs. Its currently at my in-laws house down there.