Vintage Whitehall & Armstrong DP 1 Clear Glass Insulator, Made in the U.S.A

2 Unbroken not chipped insulators The Vintage Whitehall & Armstrong DP 1 Clear Glass Insulator is a highly collectible piece made in the United States. This glass insulator would have been used on electrical or telecommunication cables to prevent electrical current from escaping. Its vintage design and American craftsmanship make it a sought-after item for collectors of glass insulators and historical artifacts. Perfect for display or adding to a collection, this piece represents a piece of American industrial history. I found these in my father in laws garage after he passed away. They look in very good shape.