Originally Posted by klhansen
This outfit Terex is the successor to Tel-e-lect Products Co. At least that's what my quicky search tells me.
They may be able to help out with info on the crane.
Agreed. It definitely looks like a rig for handling utility poles.
Their tech support page is https://www.terex.com/utilities/en/service-support/technical-service-support/index.htm Based on the info there, you should be able to quote the info on your data tag (Tel-Econ Model 10A, serial 1152 and ask what they can provide to help you restore/maintain the equipment to be safe. The safety requirement might include them having to make data plates for controls and load limits available (maybe expensive to get singles made). It never hurts to ask.