This video about the Bus Electronic Scanning Indicator, from the late 1950's, might be of interest as well: https://www.youtube.com/watch?v=qGwZwe6izTg https://

This video about the Bus Electronic Scanning Indicator, from the late 1950's, might be of interest as well: https://www.youtube.com/watch?v=qGwZwe6izTg https://www.youtube.com/watch?v=qGwZwe6izTg