Notes: 1939-1945 World War II, Government limited the use of metals except for weapons.

It was an opposite situation if compared to the US. Japan has no domestic sources of metals.

1950 Korean War breaks out. 1955 Japan low economy.

Electronic Calculators (8 digits) price becomes cheaper than mechanical calculators in 1973

Source: Record of Tiger Calculating Machine Co. (no dated) presented by Mr. Murayama (Fomer Tiger Director)

Edited by K. Kadokura