APF
APF Electronics Inc.
New-York, U.S.A.

Apf was a publicly traded company founded in 1970 in the United States dedicated to consumer electronics. The company's name comes from the initials two brothers who founded the company, Al & Phil Friedman. APF made a single programmable model using the same chipset used in the Commodore PR-100. Most models made in Asia.

Source : R/S Programmable calculators