Struggling with last few! Any clues gratefully accepted
21. Well known subtractor also gives
31. A screen for each eye and more to spare
Thanks is advance
Not sure about Tippex. Is it a subtractor/subtracter in that it takes away. The only spelling of subtractor looks to be in electronic logic circuits? And does Tippex also give....I can see the tip (gives tips) but thats all.
Its still the best so far though....
31 multiplex may be it although why 'for each eye'. Or could be gogglebox but why the 'more to spare'?