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1.35V PX-400 Film Camera Battery ADAPTER + BATTERY (Replace Mercury Cell) Fits MR-42 RM400, MRB400, H-B, For Pentax Spotmatic: Amazon.co.uk: Electronics & Photo
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Exell MRB400 1.35V Zinc Air Battery Z400PX, E400N, EPX400, H-B, KX400, MRB400, PM400R, PX400, RM400, T400N, V400PX - EveryMarket
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