Did you ever carry a slide rule in your shirt pocket?

Beats carrying an abacus in your back pocket!

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SW-User

I possibly did at school. I was there in the 70s when log tables and slide rules were the way. Calculators appeared then but schools initially banned them. By the time I did maths @ level then went to college Casio scientific calculators had one the day. I had one that did hex which helped me debug z80 assembler code