What major innovation facilitated the mass production of uniform, durable wax cylinders?

Answer

The Gold Moulded recording process

The Gold Moulded process involved electroplating a master recording (coated in gold) to create metal molds, which were then used to shape the final listening cylinders, ensuring greater uniformity.

What major innovation facilitated the mass production of uniform, durable wax cylinders?
inventiontechnologyaudiosound recordingCylinder