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Laws requiring county-of-origin labels seem to have been a response to German industrialization. According to a report by the U.S. International Trade Commission: Country-of-origin marking laws were first enacted in the 1880s in various European countries* to distinguish imported goods (particularly German goods) from domestic goods, and became ...


8

The earliest I could find was by a John R. Norris in 1957 for a radio earpiece: There are a lot of behind-the-ear headphone/microphone combos, but that's not quite what you're asking about. The first dedicated behind-the-ear headphone I found was Simeon Schreiber's 1988 "Bone Conduction Audio Listening Device and Method": But importantly, the first patent ...


6

Regarding technology in the 1930's: Steam-powered or electric train locomotives (very few diesels). Propeller-driven aircraft (no jets yet); dirigibles were also in use. All electronics was driven by vacuum tubes (no transistors yet). Only AM radio (no FM), most radios were pieces of furniture. No TV. Most movies were still in black & white. ...


6

The following video should give you an overview of the working class experience of the 1930s in the United States, combined with a basic look at the material culture of the era. youtube: US Dept. Labor For an depth accounts, I have to immediately recommend social history. ABC-CLIO publishes a ten volume account of the United States in the 20th century, but ...



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