Improvements in electric primary cells

摘要

990,143. Electric cells. VARTA PERTRIXUNION G.m.b.H. April 17, 1963 [June 1, 1962], No. 14993/63. Heading H1B. A relief valve for a primary cell comprises a resilient membrane 2 seating on a member 6 and yielding to excess pressure. The cell is of the zinc-alkaline type.