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This is a hard to find power plug that is used on the early Loran-C navigation units from the 1980s. The correct number is Amphenol 57-10140. 罗兰 导航 安费诺 罗兰股电源插头
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From Practice and science of standard barbering (c1951) Author: Thorpe, Sidney Coyne from archive.org 电力 电气 电源 电源插线板
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