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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