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Thank you for providing the updated information about the DTH drilling rig.

Main feature:

1. The HW938 model is specifically designed for drilling blast holes with a diameter range of 90-138mm, which aligns with the mentioned specifications.

2. The rig is equipped with a dry dust collector, which helps in minimizing environmental pollution. It also features a drill pipe changer, allowing for efficient and convenient pipe replacement during drilling operations. The rig incorporates advanced design and layout for enhanced performance.

3. The HW-920 model, purpose-built for hard strata conditions, is a suitable choice for metal, limestone, dolomite, and aggregate open cast quarries and mines.