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Calculators: Litton-Monroe / Litton-Royal / Litton-Royal-Imperial
European office equipment supplier owned by Imperial, famous for their typewriters. It appears that it became part of the Royal group and bought out the US Monroe company.   Any help on this very complex situation would be gratefully received!

 
Royal Royal Digital 5-T

Monroe 30

Litton Royal RC-84

Royal
1973
Royal Digital 5-T
1973
Monroe 30
1974
Royal RC84
1976