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- IOTW CD 100 (19,194 views)
- IOTW CD 141.6 (18,575 views)
- IOTW CD 285 (18,530 views)
- Insulator Tidbits (18,324 views)
- CDs 287, 287.1, and 287.2 (17,571 views)
- Unused Consolidated Design Numbers (17,510 views)
- Elmer, NJ Glass Companies (16,274 views)
- IOTW CD 145 (15,808 views)
- CD 208 Hemingray Dot Patterns (15,223 views)
- IOTW CD 199 (14,730 views)
- Chicago Insulating Company (14,168 views)
- IOTW CD 103 (13,551 views)
- A.A. (13,434 views)
- IOTW CD 151 (12,938 views)
- S.S.& CO. (12,579 views)
- IOTW U-274 (12,387 views)
- Adamant Porcelain Company (11,783 views)
- IOTW CD 292 vs. CD 296 Discussion (11,732 views)
- IOTW CD 250 (11,563 views)
- Consolidated Design Number Summary (11,528 views)
- Current events (11,439 views)
- First Threaded Insulator (ICON) (11,427 views)
- Hemingray (11,338 views)
- IOTW CD 109 (11,258 views)
- Electrical World (11,016 views)
- Brookfield Dark Aqua (10,659 views)
- A History of the Consolidated Design Numbers (10,564 views)
- IOTW CD 130.1 (10,488 views)
- Akron Smoking Pipe Company (9,973 views)
- Akron High-Potential Porcelain Company (9,013 views)
- HEMINGRAY (Primary Embossing) (8,463 views)
- Operator (8,184 views)
- Embossing Histories (8,044 views)
- Shape Pairs (7,754 views)
- IOTW CD 187 (7,407 views)
- IOTW CD 105 (7,330 views)
- IOTW CD 256 (7,214 views)
- IOTW CD 140 (7,194 views)
- IOTW CD 232.2 (6,861 views)
- IOTW CD 188 (6,751 views)
- Gray & Hemingray Insulators (ICON) (6,166 views)
- Yellow Californias (ICON) (6,130 views)
- Electrical World and Electrical Engineer (6,092 views)
- Operator and Electrical World (5,982 views)
- Unverified Embossings (5,923 views)
- IOTW CD 206 (5,797 views)
- Brookfield CD 110 (5,243 views)
- "Hex" Threads (4,704 views)
- Electrical World and Engineer (4,654 views)
- David Wiecek (4,250 views)
- Bad title (4,218 views)
- IOTW CD 139.9 (3,954 views)
- Brookfield Round Base (3,599 views)
- Vent Drips (3,141 views)
- IOTW CD 726 (2,962 views)
- CD Assignment Guidelines (2,766 views)
- IOTW CD 247.3 (2,565 views)
- IOTW CD 257 (2,273 views)
- IOTW CD 331 (2,209 views)
- IOTW CD 1014 (2,017 views)