Just googled a bit over here...
Meiser & Mertig were a manufacturer/wholesaler of Physics and Chemistry teaching aids. They did make a small electric trainset for Bing, and had several Bing engines in their own assortment as well.
Have not been able to find this exact engine, but am certain that someone way more knowledgeable than i, will be able to identify the details on this engine, and thereby the exact manufacturer...if it hasn´t already been done.
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