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1 résultats pour : others utilise secondary batteries or accumulators. one of the most portable, compact, and convenient forms is that of mr. pitkin.. the three-cell battery gives a light equal to 2.5 candles immediately after removal from the charging source, and lasts for nine or ten hours

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James Pitkin demonstrating his Portable Electric Lamp
ARP23A17_467

James Pitkin demonstrating his Portable Electric L...