2-piece reversible nail-knob “P. E. M. Co. knob” (made by the Porcelain Electric Mfg. Co.) formerly known as the “W. E. split knob”. When Thomas received exclusive right to make and market the knob, it was called Thomas “T. P. I. knob “.
| SELECT DISTINCT patent.*, YEAR(date) as year FROM patent LEFT JOIN category ON category.patent = patent.patent AND category.type = patent.type WHERE (category.class = '24') AND (category.subclass = '129A') ORDER BY date ASC, patent, type |
Total of 1 patents found where: Class is '24'; Subclass is '129A';
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| T / S | Patent | Date | Description | Patentee | Category | Assigned To |
| 1902 | ||||||
| U |
697,001 | April 8, 1902 | Insulator 2-piece reversible nail-knob “P. E. M. Co. knob” (made by the Porcelain Electric Mfg. Co.) formerly known as the “W. E. split knob”. When Thomas received exclusive right to make and market the knob, it was called Thomas “T. P. I. knob “. |
NICHOLS, William H. |
Knob | 1/2 to Elmer Larrabee |
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