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the first toaster was sold at a mechanic plant in Stillwater.
The first commercially sold mouthwash was Listerine.
Apple docx
The first microwave ovens were sold in 1960, but they did not become widely used until the late 1980s.
pancake mix
This is not a question, but I will tell you they were sold and in use by the mid 70's. The first ones were expensive.
Yes, ovens with broilers are still sold.
NO
St. Louis, MO, USA...World's Fair in 1904
Trek Technology and IBM began selling the first USB flash drives commercially in 2000.
Industrial ovens can be bought online from websites such as ESPEC, Furnace Brokers, Peerless Ovens, LRE, and Wisoven. Used industrial ovens are sold on the Used Furnaces website.
Microwave ovens are sold at all home appliance stores, such as Sears, Home Depot, Best Buy, Walmart, Ikea, etc. They are often also sold at furniture stores, in the kitchen section.