专利名称：SPRING RETURN CARTRIDGE 发明人：GULICK R,US
申请号：US3727523D
申请日：19710507
公开号：US3727523A
公开日：
19730417
专利内容由知识产权出版社提供
spring framework guru摘要：An actuator of the type having a spring return portion, wherein the cylinder containing the spring forms a cartridge interchangeable on the housing with other cartridges, and the cartridge is so constructed as to negate the need for venting to atmosphere.
申请人：RES ENG CO,US
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