Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US572278A Inventor Charles H Fay Current Assignee (The listed assignees may be inaccurate. Google Patents US2440503A - Magnetic gradiometerÄownload PDF Info Publication number US2440503A US2440503A US572278A US57227845A US2440503A US 2440503 A US2440503 A US 2440503A US 572278 A US572278 A US 572278A US 57227845 A US57227845 A US 57227845A US 2440503 A US2440503 A US 2440503A Authority US United States Prior art keywords coils helmholtz pivoted current vibrator Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
0 Comments
Leave a Reply. |