Is this a fist-activated tabulator? I've not seen something like this on this vintage machine (nor does the TWDB list a model 20).Vintage Remington Rand Standard/special Typewriter | ShopGoodwill.com
Another here...https://www.officemuseum.com/IMagesWWW/Remington_20_billing_typewriter_OM.JPGAnd some info. in the on-line article...about Speical Purpose typewriters :https://www.officemuseum.com/typewriters_office_special.htm
