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Model Code Explanation (D661-4438E)D661: Series (ISO 4401‑05, 24 VDC integrated ...

Model Code Explanation (D661-4436C)D661: Series (ISO 4401‑05, 24 VDC integrated ...

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Model Code Explanation (D661-4385C)D661: Series (ISO 4401‑05, 24 VDC integrated ...