http://AATesaurus.cultura.gencat.cat/aat/getty_enhttp://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31420337drills by mode of operation http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31420337 drills BT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31420337 electric drills NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31420337 pneumatic drills NT http://AATesaurus.cultura.gencat.cat/aat/getty_en?tema=31420337 hand drills NT