László __, inventor who patented his ballpoint pen in 1938 (4)

I believe the answer is:

biro

(Other definitions for biro that I've seen before include "Writing implement" , "Lazlo -, ballpoint pen inventor" , "Laszlo Jozsef -, ballpoint pen inventor" , "Pocket item" , "writer" .)

I've seen this clue in The Guardian.

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