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Have a look at the "Matilda Diaries
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Brad, thanks for posting that link....great to follow the restoration of the Matilda!
The lettering on the steel beams you see in the video is a modern day equivalant of the punched numbers and is either done by laser printing, or by inkjet printing like in this case. It's not so much intended to mark certain parts, but more aimed to easily identify the type and measurement of the profiles, as well as the makers name. You also see bar codes these days containing info on material properties etc.
Alex