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Pole Top Discoveries' "Late August" Auction (Closed #281416)

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#640 - CD 120 - PAT APP FOR. - Blue.

  Lot # 640
Listing Image
Pole_Top_Discoveries
Details
  • Lot # 640
  • System ID # 286283
  • End Date
  • Start Date
Description

#640       CD 120       PONY      PAT APP FOR.        Brooke's blue.

Produced using a threading mandrel which was covered in a patent issued on August 14, 1883.  This same threading technique was also used in the production of various insulators with either "Brooke's" or "Patent Applied For" marking on CD 120, 125, 133.1 and the CD 109 and 135 Chicago Insulator Company items.

Attractive color!

Very near mint.