Invention Grant US2355297A Perforating apparatus 失效 Basic information Please log in to see more content Basic information Please log in to see more content Perforating apparatus Patent Title: Perforating apparatus Application No.: US46511342 Application Date: 1942-11-10 Publication No.: US2355297A Publication Date: 1944-08-08 Inventor: HOLT ALBERT C Applicant: IBM Assignee: Ibm Current Assignee: Ibm Priority: US46511342 1942-11-10 Main IPC: H04L17/20 IPC: H04L17/20 Information query Espacenet IPC分类: H 电学 H04 电通信技术 H04L 数字信息的传输，例如电报通信（电报和电话通信的公用设备入H04M） H04L17/00 用于发送或接收电码的设备或局部电路，其中每个字符用相同数目的等长码元表示，例如波特码 H04L17/16 .接收端的装置或电路 H04L17/20 ..使用穿孔记录器的
