Назовите подлежащее придаточного определительного предложения и переведите предложения:1.

Назовите подлежащее придаточного определительного предложения и переведите предложения:
1. Morse invented a code that used dots and dashes for letters of the alphabet. 2. Al.Bell found an assistant who was a specialist in electrical engineering. 3. They wanted to build a machine which people could use to talk over long distances. 4. A television screen and camera that will be used with usual telephone are very small. 5. People who come to the Aircraft Fair in Paris see new designs of aircraft from different countries. 6. Bell did not know German which most writers of scientific and technical papers used at the time. 7. The decimal system that was developed by French scientists was introduced in Russia by D.I. Mendeleev.