Hi 38ruk,
>I wish i had a scanner , i have a pic of my grandfather using a dozer to pull a 155mm howitser off of an Lst onto the beaches at guadalcanal . The pic says Dec. 1942.
Wow, I'd love to see that picture! :-)
>Bulldozers had been around since the earily 1900's , i believe it was 1904-5 .
Hm, reading the Wikipedia article (which appears a bit confused), I'd say that bulldozer blades had been used with various vehicles early on, but the dedicated, tracked bulldozer apparently emerged around 1940. I'm not quite sure what the critical addition was, maybe the hydraulic actuation of the blade.
Tracked tractors have been around much longer, of course!
Regards,
Henning (HoHun)