U-1897: Poland

4" X 4 1/2" (102mm X 113mm)

 

(upper umbrella incuse) 971

{Jedlina Zdrój}

 

Picture courtesy Bob Berry

This is a transposition insulator to enable telephone pairs to cross-over.

U number assignment from Worldwide Porcelain Insulators by Marilyn Albers & Jack Tod.

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