published on: 2019-04-18 12:52:56
saddbitchh666:
grindhousetheater.tumblr.com/post/184270798905/
vintagegeekculture: Hewlett Packard’s Fourier Analyzer, 1972.
Twitchy-Rose
grindhousetheater.tumblr.com/post/184271356085/
grindhousetheater.tumblr.com/post/184276183335/