A) 1. They are known to develop a new device. 2. They are known to have developed a new device. 3. He is supposed to have left Leningrad. 4. They are believed to have obtained new data. 5. Their plant is said to have produced a new kind of insulation. 6. This plant is said to produce a new kind of insulation.
B) 1. He is said to test new devices. 2. He is said to be testing a new device now. 3. He is said to have tested a new device for electronic industry.
C) 1. He is reported to grow crystals. 2. He is reported to be growing a new type of crystal now. 3. He is reported to have grown a new type of crystal.