착암기 장치 ─ 육각 및 둥근 막대형 중공강 강재
凿岩设备.六角形和圆形条形空心钻钢

2021-11-30

Rock drilling equipment — Hollow drill steels in bar form, hexagonal and round
凿岩设备——棒形、六角和圆形空心钻钢

1991-01-24

ROCK DRILLING. HOLLOW HEXAGONALDRILL. STEELS IN BAR FORM.
凿岩 空心六边形钻 棒材

1985-01-15

착암기장치 - 중공육각드릴의 단조된 칼라샹크 및 그에 적합한 척부싱
凿岩设备空心六角钻头钢用锻制带领柄及相应的卡盘衬套

2002-12-28

착암기 장치 — 중공 육각 드릴의 단조된 칼라 섕크 및 그에 적합한 척 부싱
凿岩设备.空心六角钻钢用锻制带凸缘柄和相应的卡盘衬套

2022-11-18

Rock drilling equipment — Forged collared shanks and corresponding chuck bushings for hollow hexagonal drill steels
凿岩设备——空心六角钻头钢的锻造带领柄和相应的卡盘衬套

1991-01-24

ROCK DRILLING. FORGED COLLARED SHANKS AND CHUCK BUSHINGS FOR HOLLOW HEXAGONAL DRILL-STEELS.
凿岩 空心六角钻头钢用锻造带领柄和卡盘衬套

1985-03-15