In Electronic Engineers Master Catalog 1985–86, Chicago Switch is shown to be an ITW brand.
Chicago Switch 34-Series keyboard switches are known only from a single Electronic Engineers Master catalogue entry. These are tall, slender switches suggested to be mechanical contact rather than reed. The heading “half-by-half keyboard switches” suggests that they support 0.375″ spacing.
Available options are SPST-NO, SPST-NC, SPDT and “alternate circuit”, with the last option possibly indicating alternate action.
All documents were scanned by Bitsavers unless otherwise noted.
- Chicago Switch, Inc. advertisement, Electronic Engineers Master 1971–72 Volume 2