pdf Calculagraph - Birth and Early Days of the Calculagraph - 1939 Popular
By Paul F 1121 downloads
The_Birth_and_Early_Days_of_the_Calculagraph_-_1939_tci.pdf
13 page history by Henry Abbott. Referenced in Singing Wires, April 2019. Contributed by Steve Hilsz. Scanned by Steve Cichorsky. OCR by Remco Enthoven. Processed by Paul Fassbender.
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