They seem to be related through the Gamzon patent of membrane vibrating as a whole.
The inventor from Fostex Shunichi Tabuchi side refers to the Gamzon, Frei US3209084 patent. The Foster (parent company of) Fostex patent is US3922503.
Inventor James M. Winey on Magnepan US4210786A patent refers too to the Gamzon, Frei additional patent US3013905:
https://patents.google.com/patent/US4210786A/en
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