How about Bright Alliance independent R&D capabilities?

Bright Alliance Technology Limited has been focusing on the Manufacturing Computer Hardware Tablet PC business for years. And we have won many honorary qualifications due to the outstanding R&D capabilities and superb production technology. Bright Alliance is located in a place with traffic convenience, which is conducive for both small and large purchase. Bright Alliance insists on providing customers with one-stop and complete solution from the customer's perspective. Highly reliable ODM services are also available in .

Seek the development history and technical status of vacuum trucks at home and abroad! For detailed materials, you can send them to the mailbox yan... Several inventors in the 19 th century produced a machine that sucked dirt.Most machines use a folding bellows that can be operated by hand.Some machines are made,Including the 'little Daisy' type of success.But they did not save Labor,Because two people are needed to operate,A bellows,An alignment interface.British engineer Herbert Booth made the first effective vacuum cleaner in 1901.It has a gasoline engine,And it's the first vacuum cleaner with an efficient filter,That is, it has a filter cloth to keep dirt,Bring clean air back to the room.It was a large and bulky device intended to be used in the factory.Booth's vacuum cleaner impressed American inventor J Murray Spengler.He made a smaller vacuum cleaner for home use in 1900,And sold the rights to the design to a harness maker called William H Hoover.On 1908,Hoover bega

Excuse me: the filter core with a filtration accuracy of 40 microns can filter out the gypsum (calcium carbonate) in the well water? If the aperture of 40 microns, the filtering effect should be very unsatisfactory. 4 micron or 0.4 micron is about the same (but 0.4 micron may be too good for filtration, at the expense of very slow flow rate)