What foundational physical geometry established by Berliner remained largely unchanged through the shift to vinyl LPs?

Answer

The lateral groove format

The long-term legacy of Berliner's work lies in the commitment to the lateral groove format, which proved durable enough to support advancements like electrical recording and the shift to polyvinyl chloride (vinyl).

What foundational physical geometry established by Berliner remained largely unchanged through the shift to vinyl LPs?
inventiondiscphonographgramophone