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Another technique would be to pick up readings from the propellers themselves. For example, if your dog sticks its nose into a drone’s business, the propeller could pick up on the intrusion by detecting a change in electrical current, a shift in vibrations or even a difference in the sound of the spinning blades.

Apart from its efficient products and attractive designs, Gree is well known for energy and environment conservation, winning approval from the Brazilian government.

Any advice for future collectors?

Another major move was shifting administrative departments of the Beijing municipal government to Tongzhou district in the city's eastern suburbs.

Apart from domestic aviation companies and financial leasing companies, COMAC has received 34 orders from GE Capital Aviation Services, the largest commercial airline leasing company in the world, German startup Puren Airlines, and City Airways of Thailand.