If Lucio wouldn't have sent me this crop of a 1915 Italian Newspaper,
Macchina a vapore per Caffè espresso
I wouldn't have found - while researching on it - that
there was an Export/Import business going by the name A.S. Sassoon in Milano in 1951.
And the question:
What did Mr. Robbiati invent?
is becoming even more difficult to answer.
(i hear some say - in the back of the room - the pressure valve in the knob...
yep! Well, until proof of the contrary... as usual)