Assistive products for calculation and training basic arithmetic
Abacuses, talking calculators etc. Computers and terminals, see 22 33.22 15 06
Calculators
(2 product series)E.g. calculators with speech output, large buttons, large display.
22 15 21
Assistive products for training in mathematics and physical sciences
(1 product series)Products to assist in educating a person in mathematics and the natural sciences such as biology, physics and chemistry.