What was the fundamental difference Berliner introduced regarding the groove cut on his disc?

Answer

Lateral cut

Berliner's core inspiration involved using a diaphragm that vibrated a stylus horizontally, carving a lateral groove onto a flat surface, which differentiated it from Edison's vertical groove.

What was the fundamental difference Berliner introduced regarding the groove cut on his disc?

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Emile Berliner, Kammer & Reinhardt Gramophones, First ... - YouTube

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