Brand: Sanyo
The Sanyo M-9998 is an electronic calculator model released by Sanyo (currently a Panasonic brand) in the late 1970s or early 1980s. It is a four-function calculator capable of performing addition, subtraction, multiplication, and division operations. Some potential features of the M-9998 may include a decimal/fraction mode, memory functions, and a percent key. However, without further information, it is difficult to provide a complete list of features for this particular model.