How to open safe with no handle?

I've had this safe open years ago but today I spent 2 hours trying to open it and it wouldn't. My folks left directions that say... L - 72 (4) R - 39 (3) L - 66 (2) R - ...and that's all. I'm not sure what (4), (3), etc. mean. It's hard for me to get down on the floor to see the dial and it must weigh 2-3 hundred pounds. It's a small safe, about as tall as an average chair seat, on wheels with no handle. I don't think the contents are worth hiring a locksmith. My notes say "Yale lock for safe, No 0700 Serial w360 or 366 (maybe preceeded by a 7 or a + or a scribble) M. Yard The Yale & Towne Mfg Co Stanford, Conn" Please help.