Those two clips have to be joined using the same program that they were split with,go to the link below and download HJ Split 2.3, its first at top of the page.
AJ www.freebyte.com/hjsplit/
Malcolm, the safety films that were going around in the 60s-70s were.
Roll of drums -21mins. Shake hands with danger -24mins. Multiple choice 25 m
An X factor-21m. Everything to lose-22 m. and The hazards of hurry -21mins
These were mainly kept at the Cat dealers so you could check at your local dealer Cheers Al