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41. IOTW CD 140 (16:22, 26 November 2008)
42. IOTW CD 206 (17:59, 22 December 2008)
43. Insulator of the Week (17:03, 30 December 2008)
44. IOTW CD 1014 (17:23, 30 December 2008)
45. Primary Embossing Manufacturing Dates (00:09, 16 October 2009)
46. Unused Consolidated Design Numbers (00:13, 16 October 2009)
47. Insulator Tidbits (17:41, 27 October 2009)
48. Current events (06:30, 31 October 2009)
49. Akron High-Potential Porcelain Company (20:20, 15 December 2009)
50. Chicago Insulating Company (20:20, 15 December 2009)
51. Elmer, NJ Glass Companies (20:21, 15 December 2009)
52. Electrical World (00:20, 16 December 2009)
53. Operator and Electrical World (00:20, 16 December 2009)
54. Electrical World and Engineer (00:21, 16 December 2009)
55. Electrical World and Electrical Engineer (00:23, 16 December 2009)
56. Hemingray (23:33, 16 December 2009)
57. HEMINGRAY (Primary Embossing) (00:14, 17 December 2009)
58. CDs 287, 287.1, and 287.2 (00:51, 17 December 2009)
59. CD 208 Hemingray Dot Patterns (20:52, 30 December 2009)
60. Brookfield (09:17, 10 March 2010)

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