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Keywords: CD 718 in Cobalt.jpg Pre-1870s CD718 pin insulator in Cobalt Blue - Prior to 1870 there were no threads in the pinhole Author Lee Brewer Source Picture taken by Lee Brewer en wikipedia Liftarn CommonsHelper 2007-10-01 Lbrewer42 wikipedia en Lbrewer42 Original upload log page en wikipedia CD_718_in_Cobalt jpg 2007-10-01 14 39 Lbrewer42 490×575× 186237 bytes <nowiki>Author Lee Brewer Source Picture taken by Lee Brewer</nowiki> Pin insulators |