about the pneumatic mechanism: if it's theinner tube that moves and creates the pressure (like in the Chilton Long Island FP's) or the whole barrel that slides (like in the Chilton Boston FP's).
But, the excellent review Len posted reveals the answer to my question . Thank you Giovanni and Len!

And if we have mentioned pneumatic fillers, here's the Filcao Atlantica early ancestor - the Crocker Ink-Tite blow filler which evolved later into the Chilton pneumatic fillers. It's from the first decade of 1900.





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