Rock drilling; Extension drill-steel equipment for percussive long-hole drilling; Reverse-buttress-threaded equipments 1 1/16 and 1 1/4 in (27 and 32 mm)
German title
Gesteinsbohrung; Verlängerungsgestänge zum Langloch-Schlagbohren bohren; Geräte mit umgekehrtem Sägezahngewinde 1 1/16 Zoll und 1 1/4 Zoll (27 und 32 mm)
Publication date
1970-11
Original language
English
Pages
12
Publication date
1970-11
Original language
English
Pages
12
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