DOWN-HOLE FLUID PERCUSSION DRILL FOR EARTH BORING

申请公布号：GB1246388(A)

申请号：GB19690008561

申请日期：1969.02.17

申请公布日期：1971.09.15

申请人：

PAN AMERICAN PETROLEUM CORPORATION

分类号：E21B4/14

主分类号：E21B4/14

Al-Mn/Al PLATING STEEL SHEET OF GOOD CORROSION RESISTANCE AND ADHERENCY AND MANUFACTURING PROCESS THEREFOR

WATER HEATER

APPARATUS AND METHOD FOR CONTROLLING COMBUSTION FOR AUTOMATIC PREENGAGEMENT OPERATION IN BOILER

ROTARY PISTON TYPE INTERNAL COMBUSTION ENGINE

METHOD OF EXCAVATING TUNNEL USING HAMMER DRILL AND APPARATUS THEREFOR

AIR INTAKE DEVICE FOR INTERNAL COMBUSTION ENGINE

MANHOLE TUBE-BOX ABLE STRUCTURE COMBINED USE OF MOLD

CULVERT AND METHOD THEREFOR

WORK CAR FOR EXCAVATING INCLINED TUNNEL

BUCKY FIXING AND STABILIZING APPARATUS FOR X-RAY SYSTEM

P.S. COMPOSITE BEAM FOR CONTINUOUS BEAM AND CONSTRUCTION METHOD USING IT

GAS TRANSFER SAFETY DEVICE FOR GAS TRANSPORTING TANKER LORRY

DISPOSITIVO DE DESAGUE.

CRUCIBLE FOR PRODUCING FINE WIRE-SHAPED SILICON AND FINE WIRE-SHAPED SILICON

IMAGE FORMING DEVICE

DEPOSITING APPARATUS FOR THIN FILM

IMAGE PROCESSOR

MULTIPLE LAYER PACKAGING MATERIAL WITH ONE SURFACE CORRUGATED

PRODUCTION OF DISULFIDE COMPOUND

SET BOOK-TYPE CONTAINER BAG FOR CHOPSTICKS USED FOR CELEBRATION