Plastic Tenon Screw / Mortise Bushing First Used?

[kane]

When was the contemporary type of plastic (or Delrin or nylon) push-pull style tenon screw and screw-in mortise bushing first used on meerschaum pipes? I know that bone screws were the standard before the plastic push-pull connectors. Curious when the plastic push-pull style first showed up.
Thanks

 

[jitterbugdude]

I do not know but my father bought a meer in 1972 and it had a plastic tenon (screw in type)

 

[kane]

Thank you for that info, jitterbug. I didn't realize they were in use that long ago. Good to know.

 

[disinformatique]

I think Fikri Baki was the one which started using them first. I may be wrong.