The Chinese TF-1 was a copy of the Soviet ShM-41M, but used a gray plastic assembly and had larger eyepieces. It was used for industrial purposes. This example was made by Nonkinko.
Filter side view "566 g" TF1-1L 2011-17"
Bag for TF-1 gas mask
Cardboard box for "Gas Mask TF-1, Filter IL, Helmet No. L"
TF-1 Gas Mask Operation Instruction