_____________________ bits are used when some rocks are so abrasive that steel bits have to be replaced after they have …

____________________ are ideal for drilling large diameter and deep holes in wood or thick man-made boards.

In _______________ type of gantries, derricks are built on specially constructed tower at site of work.

_________________ Gantry consists of a platform which receives and distributes the material.

The ____________ rollers are considered most suitable for compacting clayey soil or soil containing mixture of sand and …

____________________ is similar to platform gantry except that the platform is converted into a movable carriage.

___________________ equipment are used to decrease the porosity of earth and to increase the density and strength of the…

__________________ type of scraper consists of a four wheeled scrapper bowl towed behind crawler Power unit.