2. First Charles Grow invented a talking machine in 1877. Later T. Edison improved that machine and replaced a wax turntable by a tinfoil turntable.
3. First Edison ordered an apparatus which has been built for him in 1877. Later he began experimenting with it.
4. First Samuel F.B. Morse invented a telegraph in 1837. Later Thomas Edison invented and produced many new items and improvements of it.
5. First Thomas Edison and his assistants made a lot of inventions and improvements in 1877. Later he organised an "invention factory".
6. First Alexander Bell invented a telephone in 1876. Later Thomas Edison improved it making one of his first inventions.
7. First 1600 materials were tested by Thomas Edison over a year. Later he developed a light bulb.