Post Office Box, LH 22.135

LH 22.135 Post Office Box (Constantan Coil) Plug Type 3-Ratio (Routine Quality)
LH 22.136 Post Office Box (Constantan Coil) Plug Type 3-Ratio, ½” Brass Block (Superior Quality)
LH 22.137 Post Office Box (Constantan Coil) Plug Type 4-Ratio, Ring Type Brass Block (Routine Quality)
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