Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1144537A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Automatic Telephone and Electric Co LtdfiledCriticalAutomatic Telephone and Electric Co Ltd
Priority to GB1144537ApriorityCriticalpatent/GB494235A/en
Publication of GB494235ApublicationCriticalpatent/GB494235A/en
G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
G08C19/00—Electric signal transmission systems
G08C19/30—Electric signal transmission systems in which transmission is by selection of one or more conductors or channels from a plurality of conductors or channels
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
Emergency Protection Circuit Devices
(AREA)
Abstract
494,235. Electromagnetic interrupters. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and HARRISON, W. A. April 21, 1937, No. 11445. [Class 38 (v)] [Also in Groups XXXIX and XXXVIII] Self-interrupting contacts of an electromagnetic device for signalling or control purposes are shunted by a rectifier so that their opening is effective or not according to the direction of the operating current.
GB1144537A1937-04-211937-04-21Improvements in electrical signalling or control systems
ExpiredGB494235A
(en)