MineLab E-Trac, MineLab Safari, MineLab Explorer XS,
White's 5000 D, White's 6DB, White's 5000 D GEB
Sunray X-1 for the ML's, Garrett PP for the White's and a Backhoe
Remember the good old rotary dial phone well. When I was a kid in the 50's, my parent's phone was on what's called a "party line". That meant there weren't enough phone numbers to go around so about six families phones would ring at the same time and you had to determine if the call was for you. We would answer the phone if the ring tone was two short rings and one long ring.
The problem was everyone of the six families could answer the phone and listen to the conversation. I remember my mom saying she could hear the neighbor listening in because she could hear her dog barking in the background! What a system!