电报中继器限定符。可指定直流电流类型。

Telegraph repeater qualifiers. Type of direct current can be specified.

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电报中继器。可指定为单向单工、双向单工或双工运行。

Telegraph repeater. One-way simplex, two-way simplex, or duplex operation can be specified.

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电报中继器。可指定为单向单工、双向单工或双工运行。

Telegraph repeater. One-way simplex, two-way simplex, or duplex operation can be specified.

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