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由机电部北京起重运输机械研究所和浙江省瓯海县长征电子设备厂共同研制了JS□系列时间继电器。该继电器在计量检测与工业性试验的基础上,于1990年7月通过了由温州市科委组织
JS □ series time relays have been jointly developed by the Beijing Institute of Crane and Transport Machinery and the Changzheng Electronic Equipment Factory of Ouhai County, Zhejiang Province. The relay in the measurement and testing based on industrial tests, in July 1990 adopted by the Wenzhou Municipal Science and Technology Commission