At the entrance of No. 109 Court Road in Boston, the United States, there is a bronze plaque that reads: "On June 2, 1875, the telephone was born here."
This plaque tells the world: the world's first telephone was invented by the United States Invented by Alexander Bell and his assistant Watson.
On February 14, 1876, Bell filed a patent for the invention of the telephone. On March 6 of the same year, the patent application for the telephone was approved by the US government, and the patent number was 174465.
After Bell applied for a patent for the invention of the telephone, German science teacher and inventor Johann Philip Rice sued Bell to the U.S. Supreme Court, saying that the invention of the telephone should belong to him. Because as early as 1860, he had invented the "telephone device", which could transmit sound to 100 meters away, and Rice also exhibited his "telephone device" at various academic conferences.
Bell said frankly that he did learn from Rice's "telephone device" when he invented the telephone, and found its shortcomings. So, he changed all the intermittent currents in the Rice device to continuous direct current, thus solving the problem of short and variable speech. Then, he turned a screw on the Rice device forward by half a turn, or just 0.5mm, so that the sound could be transmitted to each other.
The findings of the Supreme Court of the United States showed that Rice had indeed successfully developed a "telephone device" before Bell, but it had some shortcomings. . Therefore, the Supreme Court ruled: Rice lost the case, and the invention of the telephone still belongs to Bell.
Because Bell borrowed Rice's "telephone device", he proposed to share the patent of the telephone with Rice, but Rice firmly rejected Bell's kindness, he said with emotion: "I am 0.5 mm away from success. If I fail, I will remember this lesson for the rest of my life."
Missing a tiny bit is a thousand miles away. Bell stood out among the inventors and became the only "father of the telephone", but Rice missed this far-reaching great invention. This major success and failure, in a certain sense, is actually only a difference of 0.5 mm.