Third installation at LaPorte, Indiana. Earliest use of switch with semi-cylindrical bank and shaft with vertical and rotary motions. Invention of earliest dial-type calling device.

• 印第安纳州拉波特完成史端乔系统第三次安装。最早使用具有半圆形排线架的交换机和具有垂直和旋转运动方向的轴。发明早期拨号型呼叫设备。