INDICATORS ON DEEP HOLE DRILLING AND BORING MACHINE YOU SHOULD KNOW

BTA means "Boring and Trepanning Affiliation" which was dominated with the now liquidated organization Gebrüder Heller in Bremen Germany. Under their Management, The brand new process was designed during the 2nd World War by combining their own individual developments with All those of Burgsmüller and Beisner. Burgsmüller replaced the grooved dr