Jig fiting up plug socket in bottom of ship

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(Plug socket) with bottom ship the device plug socket without welding the memo holder to through the bolt and moves the data to the other earth or, time required for the work saved provided mounting structure having robustness constant at welded joints, and a a firearm such as a work do not require treatment with a safety of an operator a vessel bottom can relates to memo holder adapter plug with on/off switch.