For the most part pin routers were used in the early days. CNC didn't really become commercially viable until the late 70's early 80's. I doubt Gibson had CNC until at least the mid 1980s. Doesn't mean they weren't mass producing. The pin router was very similar to CNC only controlled by a human. Cost benefit analysis would've made the decision for them. Was it cheaper to buy computers and computerized machines to do a certain job? Cost of computers VS human wages. Cheers Peter.