Picked up at thrift for $2.39. What can I say? I’m a sucker for card index boxes…

I can’t make out the smudged black-stamped bottom of the box to determine the manufacturer who used a sphere and a triangle in their logo. 

I'm a biomedical and electrical engineer with interests in information theory, complexity, evolution, genetics, signal processing, IndieWeb, theoretical mathematics, and big history. I'm also a talent manager-producer-publisher in the entertainment industry with expertise in representation, distribution, finance, production, content delivery, and new media. View all posts by Chris Aldrich