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Canon F31 00Canon F31 01Model: F-31
Battery:  2 x AA

Adapter:  
Year: 1977
Chip: TMS1045
Manual:
Info: The Canon Palmtronic F-31 is another calculator based on the TMS1000 Microcomputer family. The TMS1045 found inside the F-31 is simlar to the calculator circuit of the TI-2550-III./ Made in Japan