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.