Gray's Telephone system. Elisha Gray (1835 - 1901) developed a telephone prototype in 1876 in Highland Park, Illinois and is considered by many to be the true inventor of the variable resistance telephone. Despite losing out to Alexander Graham Bell for the telephone, Gray was awarded over 70 patents for his inventions.

px px dpi = cm x cm = MB
Details

Creative#:

TOP23761783

Source:

達志影像

Authorization Type:

RM

Release Information:

須由TPG 完整授權

Model Release:

No

Property Release:

No

Right to Privacy:

No

Same folder images:

Same folder images