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There are no labels anywhere to identify the manufacturer. Simply run your wires through the solder lugs, apply a drop of solder or electroconductive glue, and you'll have 4.5 volts of DC power. Run a pair of holders in series if you need 9 volts.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.