Litton

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! Some of the later Imperial / Royal calculators are very similar to Adler models. See Litton-Monroe / Litton-Royal / Litton-Royal-Imperial
Litton Industries at one time owned Royal, Imperial, Triumph, Adler and Monroe - see under these names.