You're not just going to have that, So, first of all, you had sound. You had a bell, so if anything went wrong —  — or the machine needed the attendant to come to it, there was a bell it could ring.  And there's actually an instruction on the punch card which says "Ring the bell." So you can imagine this "Ting!"
一緒に使う付属品が必要です 第一に サウンドです ベルを付けるんです 何かがまずくなった時や マシンに何か人手が 必要な時に 鳴らすベルです  パンチカードで入力する 命令に 実際 「ベルを鳴らす」というのがありました 想像してみてください