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Significats de improve phonograph en anglès

Encara no tenim significats per a "improve phonograph".
Ús de improve phonograph en anglès
1
A parcel, sent to her by express, contains a cylinder to the improved phonograph.
By Water to the Columbian Exposition
2
The graphophone is an improved phonograph, the cylinder being of hard rubber instead of wax.
The Great Round World and What Is Going On In It, Vol. 1, No. 28...
3
The next step toward the evolution of the improved phonograph of to-day was another form of tin-foil machine, as seen in the illustration.
Edison: His Life and Inventions