multiple drill การใช้

Several tries at drilling holes, first individually, then in a multiple drill-press proved that the concept was sound, but the production process was too costly.
The Brigade Color Guard is separate from the Varsity Color Guard team and the Drill Team, which are considered quasi-sports teams that compete in multiple drill competitions in the Spring, with the first competition always taking place at Benedictine ( others are held throughout South Georgia ).
Recognized mineralized zones were assayed using conventional fire assay with an atomic absorption or gravimetric finish, and at the end of the program, sample composites ( made by combining reject samples from multiple drill holes previously analyzed by conventional fire assay ) were made and sent to Lakefield Research for metallurgical testing.