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Calculators: Rockwell (USA)
were one of the early single-chip manufacturers who bought the calculator company Unicom.  They issued a large range of similar calculators and also allowed branding by such companies as House of Fraser and Galfa.  The green 9TR (actually an 8R) below was for True Value Stores in the US but it maintained the Rockwell branding so it's included here.  Click to see a more in-depth reference guide.  It appears that Sumlock Anita Ltd was the UK agent for Rockwell in 1974/5.

204 Financier 10R 20R 30R 51R 61R 63R
204 Financier
1974
10R
1974
20R
1974
30R
1974
51R
1974
61R
1974
63R (type I)
1976
63R (type II)
1976
8R 9TR 18R 21R 31R Slide Rule Memory
8R
1975/6
9TR
1975/6
18R
1975
21R
1975
31R
(Type 1 Mex)
1975
31R
(Type 2 UK)
1975
76
(18R clone)
1976
14RD 14RD-II 24RD

24RD-II

44RD
14RD
1975
14RD-II
1976
24RD
1975
24RD-II
1976
44RD
1976
64RD
1976
the 18T 20T the 24K the 22K the 24K II
the 18T
1976
the 20T
1977
the 24K
1976
The 24MS
1976
the 22K
1976
the 24KII
1976

Desktop models

320
1976