For example, BQ core barrel is ideal for use in most surface drilling conditions and is available for application in standard DCDMA B size hole; BQU Piling Rig Hard Rock Core Barrel is ideal for use in most underground drilling conditions and is available for application in standard DCDMA B size hole; NQ core barrel is ideal for use in most surface drilling conditions and is available for application in standard DCDMA N size hole; PQ Rope coring drill pipe rod coring barrel is ideal for use in most surface drilling conditions and is available for application in standard DCDMA P size hole; HQ core barrel is ideal for use in most surface drilling conditions and is available for application in standard DCDMA H size hole and so on.
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