Not sure I'm offering either, per se, as I don't have hard discontinuation dates on hand for any of the three styles; too, I vaguely recall discussion that the first category cited started before the formal end of the war, though we tend to call them "post-war".
I am offering what I believe to be three feature sets that appeared in the sequence listed during 1945-1948.
-d
I was trying to designate (approximately) post-war pre-Snorkel periods of varying extents (so, all starting at the same point around 3/1/45), just to clarify. Tricky, with all the changes of materials/fillers/etc.
- Post-war celluloid period
- Post-war pre-Touchdown period (includes Forticel items)
- Post-war pre-TM Touchdown period (includes first round of Touchdown items as well as lever-fillers made during that period)
- Post-war pre-Snorkel period
- Post-war pre-PFM period (?)
Segment terms could be
- Post-war celluloid period
- Pre-Touchdown Forticel period
- Pre-TM Touchdown period (possibly ambiguous wording -- could be wrongly taken as "pre-TM-Touchdown period", meaning the whole time before TM Touchdowns; maybe use "Touchdown period (pre-TM)")
- TM Touchdown period
- Snorkel period
--Daniel