See if this helps any.
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http://www.insulators.info/porcelain/history.htm
and this
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http://www.insulators.info/porcelain/
look under spool insulator
BA
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http://www.nia.org/general/p_spool.htm
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http://www.thunting.com/smf/index.php/topic,14112.msg89824.html#msg89824
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