Patent certificate

$Patent No. of a ton bag packaging device for oil fracturing proppant: ZL 2017 2 0793140. 8$

Patent No. of a ton bag packaging device for oil fracturing proppant: ZL 2017 2 0793140. 8

$A frequency conversion vacuum mud squeezing device used in the production of refractory plastics Patent No.: ZL 2017 2 0793706. 7$

A frequency conversion vacuum mud squeezing device used in the production of refractory plastics Patent No.: ZL 2017 2 0793706. 7

A kind of automatic batching equipment for wear-resistant castable production Patent No.: ZL 2017 2 0793147. X

Patent No. of an efficient induction heating device for wear-resistant coating:ZL 2017 2 0793146. 5

$Patent No. of an automatic batching device for production of oil fracturing proppant: ZL 2017 2 0793690. X$

Patent No. of an automatic batching device for production of oil fracturing proppant: ZL 2017 2 0793690. X

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