1.35v PX-400 Film Camera Battery Adapter 6 Battery replace - Etsy
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Wein Cell 1.35v MRB400 - LeZot Camera | Sales and Camera Repair | Camera Buyers | Digital Printing
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The Vintage Collective - No more battery problems for the Pentax Spotmatic SP The Maxell 394 silver oxide battery os a replacement for the discountinued PX-400 (RM400R) battery 🔋 🎞 Maxell SR936SW (
Keppler's Vault 62: Battery Mess - mike eckman dot com