what is ds

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The DS is Dual Monitor Switch for Von Duprin 6000 series electric strikes. DS option cannot be added to a Von Duprin 6000 series electric strikes in the field. It is only available factory inst...
The 6211 would be the most common electric strike to be used with cylindrical locks on a single door application.  Check the template to confirm compatibility with specific cylindrical lock model n...
The Touchplate Relays were lighting control relays, used in automated (computer/building controlled) lighting systems in large buildings. They are an obsolete LCN product. LCN only made these relay...
DS