公开/公告号US3899213A
专利类型
公开/公告日1975-08-12
原文格式PDF
申请/专利权人 THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE DEPARTMENT OF TRANSPORTATION;
申请/专利号US19740449327
申请日1974-03-08
分类号G01T1/169;G01N21/38;
国家 US
入库时间 2022-08-23 03:27:54