例句與造句

1. The Bell Telephone Company was started on the basis of holding " potentially valuable patents ", principally Bell's master telephone patent # 174465.
2. By 1879 Hubbard was able to interest Bell in improving upon the phonograph, and it was agreed that a laboratory should be created in Washington, D . C . Experiments were also to be conducted in telephone and other telecommunication technologies such as the numerous legal challenges to Bell's master telephone patent of 1876.
3. It's difficult to find master telephone patent in a sentence. 用master telephone patent造句挺難的