M-4325 marked Pittsburg
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| Marking on a recently found M-4325 marked Pittsburg probably used on the Snoqualmie-Seattle line described in this issue. This is the only whole marked specimen of this insulator known. |
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| Marking on a recently found M-4325 marked Pittsburg probably used on the Snoqualmie-Seattle line described in this issue. This is the only whole marked specimen of this insulator known. |
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