That's the way I read and interpreted it but more external inputs needs to be entered. I don't doubt Jacob Holtzer as the steel source but they peddled bars. So there must have been an intermediary between the bar stock and the tube in the rough. In comparison it is quite easy to cut & polish a tube in the rough vs. whopping on a bar of steel to convert it to a rough tube. For the post WWI period, I'd really like to see an inventory of Pratt & Whitney machines to support the effort of tube making.

Yeah, V-C were really adamant on control of the overall process for some reason. Maybe wanted to protect their Helibloc contribution.

Kind Regards,

Raimey
rse