FWIW I worked on the early B17xx series (field engineer). That was in
1977-1978. I don't think I ever saw a 1900 series.
--
The 1800's would have just been hitting the field then. 1900's did't
make it out until the early 80's
Some nice pics of the 17xx up now under
http://www.bitsavers.org/pdf/burroughs/B1700/B1700_brochures/
esp
http://www.bitsavers.org/pdf/burroughs/B1700/B1700_brochures/1066149_1700/1…