The phonograph is not of any commercial value.

Light bulb, phonograph, inventor

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Details

Context

Early assessment of his invention

Date / Period

1878

Source

https://www.nps.gov/edis/learn/historyculture/the-phonograph.htm

Verification

Unverifiable

Explanation

Found in 1 providers: grok

Method

Cross Reference

Sources Checked

1 source

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