I’ve put together an article on the US experimental T1-T4 series .90 inch cannon and posted it on my website here: http://www.quarry.nildram.co.uk/CAL90.html
I’ve put together an article on the US experimental T1-T4 series .90 inch cannon and posted it on my website here: http://www.quarry.nildram.co.uk/CAL90.html