The sequence control unit i±↕ §s a mechanical key iss§₽uing/control device. It is norγ mally placed locally to ∑≠↑the valve system. It differs from a↕ key exchange unit i↓<§n that, upon inserting γ a permit key, a selec∞≥¥tor knob is rotated to a fi≈αxed position before the next ke'✘≤¶y is issued.
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