У вашего броузера проблема в совместимости с HTML5
Running A 1968 Cat D9G this machine is equipped with a cushion blade and a rear push block for pushing scrapers and no ROPS it felt weird without one as its the only dozer that I have ran that didn't have one.cat did not start equipping them until I think 1969 when OSHA mandating them on all machines built after that,