4/29/2023 0 Comments Porthole door238000004519 manufacturing process Methods 0.000 description 1.239000005357 flat glass Substances 0.000 abstract description 4.239000004416 thermosoftening plastic Substances 0.000 claims 2.229920001169 thermoplastic Polymers 0.000 claims description 3. 238000007689 inspection Methods 0.000 claims abstract description 25.
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