Now I hate to be playing the role of Devil’s Advocate on this, but ……
UL (Underwriters Laboratories') certification is not mandatory for all saleable goods. But, on the contrary, the per say “mandatory restriction” that a purchased item must be UL certified and/or have a UL Label attached is determined by the purchaser of said items. For example, iffen you want to sell your applicable “item(s)” to a government entity, a distributor, a wholesaler or a retailer of similar products …..or as a “vendor item” to another manufacturer, you best get it UL certified before you even offer it for sale. No UL certification makes the item a potential “liability problem” that everyone but the “end user” wants to avoid. And ps, UL certification costs a “ton of money”…. which the “little guy” can’t afford.
Anyway, all of the above was simply “justification” for me tending to think that the items in question were originally electrified and were made in the US. Also, to me, the positioning of the welded “hollow” square tubing infers/indicates original electrification.