Western Electric VerticalLateral Recording Characteristics 1942 NAB drawn on Nov 23 1942<br>Western Electric 社の縦振動横振動用録音カーブ 1942 NAB verticallateral をプロットした貴重なグラフ Nicholas Bergh さん提供<br>photo courtesy of Nicholas Bergh
Standard Frequency Characteristics for “Vertical and or “Lateral” Recordings (Nov. 23, 1942)