My state association recently posted the film of the 1977 state championship match on YouTube. I started officiating in 2001 with side out scoring and striped shirts, but I had no idea some of the 1970's mechanics I saw in the film ever existed. They utilized four line judges (used at some levels today) and the umpire appears to start at the intersection of the sideline and the attack line and then run to assume a kneeling position
under the net. That really blew me away. Click the following link to see for yourself:
1977 IHSA Girls Volleyball Class AA Champ. Game: Chi. (Mother McAuley) vs. Burbank (Queen of Peace) - YouTube