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== Enllaços externs ==
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* [http://www.antiquewireless.org/uploads/1/6/1/2/16129770/09-the_mallory_bias_cell.pdf The Mallory Bias Cell] {{Webarchive|url=https://web.archive.org/web/20160527230101/http://www.antiquewireless.org/uploads/1/6/1/2/16129770/09-the_mallory_bias_cell.pdf |date=2016-05-27 }}
* [https://web.archive.org/web/20120224182730/http://users.erols.com/radiola/C51man.htm Instructions for Operating]
* [https://antiqueradio.org/bsupply.htm Powering Your Antique Battery Radio]
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