THE 



Bell Te 



COMPANY. 



125 MILK ST., BOSTON, MASS, 



This Company owns the Letters - Patent 

 No. 186,787, granted to Alexander Graham 

 Bell, January 30th, 1877, the scope of which 

 has been defined by the Supreme Court of 

 the United States in the following terms ; 



' ' The patent itself is for the mechanical 

 structure of an electric telephone to be used 

 to produce the electrical action on which the 

 first patent rests. The third claim is for the 

 use in such instruments of a diaphragm, 

 made of a plate of iron or steel, or other ma- 

 terial capable of inductive action ; the fifth, 

 of a permanent magnet constructed as de- 

 scribed with a coil upon the end or ends 

 nearest the plate; the sixth, of a sounding 

 box as described ; the seventh, o£ a speaking 

 or hearing tube as described for conveying 

 the sounds ; and the eighth, of a permanent 

 magnet and plate combined. The claim is 

 not for these several things in and of them- 

 selves, but for an electric telephone in the 

 construction of which these things or any of 

 them are used." 



This Company also owns Letters-Patent 

 No. 463,569, granted to Emile Berliner, No- 

 vember 17, 1891, for a combined Telegraph 

 and Telephone, and controls Letters-Patent 

 No. 474,331, granted to Thomas A. Edison 

 May 3, 1892, for a Speaking Telegraph, 

 which cover fundamental inventions and 

 embrace all forms of microphone transmit- 

 ters and of carbon telephones. 



SCIENCE. 



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