[cardiffspaceman]

When Yosemite Mountaineering School classes went out to the rock they used nylon ropes, in 1975. I was never more than a student of climbing but everything that has been mentioned in this thread was being done, and written up in books you could buy at Kelty, in the mid 70's. Dawn Wall was climbed with 300 bolts on its first ascent (but bolt usage was ahead of its time). The 'harness' is the main refinement I would say was lacking. YMS classes were taught to put on, and the books described, the swami belt (not unknown today, but not preferred?) made on demand from webbing. Cams were advertised but chocks/nuts were the standard.

[ip26]

I doubt cams were advertised in '75. Friends were created in '78.

[apathy]

Greg Lowe’s cams predated friends by about 3-4 years