The launching charge then a time fuse to the first display charge#2 then to the second display charge#1. very typical of modern fireworks just unique method to launch.
scrap… I like your sectioning work. I have this cartridge and never knew what was inside. Thanks.
I have just come across with this headstamp (T.F 9). I have the blank headstamp as well as the GJ on the sane cartridge. Both are from SFM.
This TF 9 (Tardy Freres) is also a SFM unit?