pipe tongs造句

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.

The novel scheme can solve the problem that speed for adjusting jaw opening is too slow for the prior-art pipe tongs.

The utility model has the advantages that reversing work does not need to be carried out by manpower with pipe tongs, the operators have no danger and the human casualty accidents can not occur.