special postal articles: referring to postal date-marks, postal tongs for lead sealing and postal bags.
邮政专用品：指邮政日戳、邮政夹钳和邮袋。
Lead and backup tong-men should not stand between the two pipe tongs while the driller is making up or breaking out pipe or collars.
当司钻正在上卸钻杆和钻铤时，内外钳工不要站在两个大钳之间。
Special postal articles refer to postal date-marks, postal tongs FOR lead sealing and postal bags.
指邮政日戳、邮政夹钳和邮袋。
Special postal articles refer to postal date-marks, postal tongs FOR lead sealing and postal bags.
指邮政日戳、邮政夹钳和邮袋。
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