Yokogawa
Yokogawa-Hewlett-Packard, Ltd.

Yokogawa-Hewlett-Packard was established by Yokogawa Electric Corp. (Japanese leading electric company in the measurement and control systems) and Hewlett-Packard 1963. The calculator production started in 1969. They renamed their name "Hewlett-Packard Japan, Ltd" in 1995.
Some calculators sold by Yokogawa-Hewlett-Packard have logo "YOKOGAWA-HEWLETT-PACKARD".

Source : epocalc