Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I am a little confused
Is it a Doll or Bing ? As you keep referring to both

Cheers
Dennis

Allow me to try and explain (it is not simple :-0
It appears that the Doll & Co line of toys (and others) were put to market in USA, (through Sears I think), by the 'Bing Wolf Corp' establishment.

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Here are three of the Doll type Bing things marketed by the Bing Wolf Corp.
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And a Doll Lokomobile by the same arrangement.
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