If you enjoyed this, back in 2015 I wrote a feature about Lore Harp McGovern and her business partners for Fast Company that goes into the creation of Vector Graphic in detail: https://www.fastcompany.com/3047428/how-two-bored-1970s-hous...
(Love your ongoing blog and output)
I’d love to read more about these products and their history. It was all very opaque. Even back then.