Porcelain Insulators from Unknown Origins
This section contains insulators for which the origin is unknown - If you have any information on where these were made or used please contact webmaster. These insulators are identified by U-numbers, but in the range of 1000-3999. The link below is for the reference book that covers these insulators.
Worldwide Porcelain Insulators (Unipart Pin Types)
|Insulators of unknown origin|
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