4 Unidentified porcelain signals

By Ryan Foster; posted January 12, 2004

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I've found these 4 porcelain signals on a line nearby. the two on the left are unlike any I've seen before, the second from the left is marked LOCKE 23507 and the two on the right are both marked LOCKE on the dome. Any help identifying any of these would be appreciated, a picture of the bases follows