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Graham Bell
1847-1922
 
In 1876, march 7th, the United States Patents Office gave to Alexandre Graham Bell the Patent Number 174.465 to "The method of, and equipament to, voice telegraphic transmition or any other sound... originated by electric waves, in a shape similar to the air vibration of the speach or any other sound".

To produce your directories is our business...

DPI Directory Publishing International
Today our operations are concentrated in five areas:

1 - Publishing planning and process
2 -
Systems implementation and development;
3 -
Directory production;
4 -
Comercial training and planning;
5 -
Operational training and consulting.


For any further information:
picheng@picheng.com.br

 

 

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