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Calculators: Adler 
Germany company that issued a wide range of calculators that appear to be linked to the brand Imperial.  There are usually two model numbers - both are given below.

80C

80S

Adler 81c 121C E29
81S
(EC 11)
1973
80C
(EC 21B)
1975
80S
(EC 22B)
1976
81C
(EC23B)
1975
81S
(EC24B)
1976
82M
(EC26)
1975
88T
(EC25)
1975
121C
(EC29)
1975
81CS 81CS type II
81CS
(EC41) Type I
1978
81CS
(EC41) Type II
1977
81SN
(EC63)
1978