スライドルールでしょう
suraidorūrudeshō
1. Probably a slide rule.
Noun
#3031327
1. Probably a slide rule.
1. rule
1. it seems; I think
2. right?; don't you agree?
1. by rule; according to rules
1. Rules; Of rule
1. It is a rule.; Is a rule.
1. Was a rule.
1. If the rule; When the rule
1. If the rule…; When the rule…