That is made by National. They made "badged" machines for many resellers, however "Eldredge" was one of their names, as National was formed by the merger of Eldredge, June and I think one other company.
The hard part about manuals - since National sold so many badged machines (like 600-1000 different names) most of their manuals do not have a machine name or model on them. They look rather generic so you often have to match the pictures with your machine to get the correct one.