Which two inventors, exploring Bell’s telephone technology, also experimented with wax cylinders?

Answer

Chichester A. Bell and Sumner Tainter

Chichester A. Bell and Sumner Tainter were active in similar recording research and made improvements to both the recording mechanism and the blank medium itself.

Which two inventors, exploring Bell’s telephone technology, also experimented with wax cylinders?
inventiontechnologyaudiosound recordingCylinder