Which inventors contributed concepts related to the moving-coil design in the late 19th century, indicating awareness of better transducers?

Answer

Oliver Shallenberger, William Lavery Brown, and Thomas Lambert

Inventors such as Oliver Shallenberger, William Lavery Brown, and Thomas Lambert all contributed concepts related to the moving-coil design in the late 19th century, even though manufacturing precision limited commercial viability then.

Which inventors contributed concepts related to the moving-coil design in the late 19th century, indicating awareness of better transducers?
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