-
公开(公告)号：US2690523A
公开(公告)日：1954-09-28
申请号：US26431251
申请日：1951-12-31
Applicant: IBM
Inventor： SPONSLER JOHN B
IPC: H01J21/20
CPC classification number: H01J21/20 , H01J2893/003
-
2.发明授权Method of and means for preparing magnetizable bodies to receive and retain magnetic impressions 失效用于制备可磁化体以接收和保持磁性印象的方法和装置
公开(公告)号：US2288862A
公开(公告)日：1942-07-07
申请号：US36259440
申请日：1940-10-24
Applicant: IBM
Inventor： OTTO WEITMANN , SPONSLER JOHN B
IPC: G11B5/03
CPC classification number: G11B5/03 , Y10S29/028
-
Search Results
2
records
(took 0.007 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
