Core position indicator for well drilling apparatus

申请公布号：US1803785(A)

申请号：US19280291293

申请日期：1928.07.09

申请公布日期：1931.05.05

申请人：

EDWARD ABLER JOHN

发明人：ABLER JOHN EDWARD

分类号：E21B25/16

主分类号：E21B25/16

NEGATIVE POTENTIAL TREATING APPLIANCE

AUTOMATIC ANALYZING DEVICE FOR HEART BEAT OF EMBRYO

FABRIC SMALL ARTICLE SUCH AS COMMUTATIONNTICKET HOLDER * CARD RECEIVER * BOOK COVER OR BAG

DRIVE LEARNING DEVICE

ORIGINAL PLACEMENT POSITION CHECKING METHOD

TABLEWARE WASHING MACHINE

CARRIER FOR DEVELOPING ELECTROSTATIC IMAGE

DETECTION OF SCANNING LIGHT BEAM PASS TIME

HEATERRCOOKER

HIGHHFREQUENCY HEATER

AUTOMATIC COOKER

COMBUSTOR

METHOD OF STARTING PULVERIZED COAL COMBUSTION BOILER

CONTROLLER FOR INTERNAL PRESSURE OF BOILER FURNACE

VERBINDUNGSEINRICHTUNG

PROCESS

A SMOKE DETECTOR

EXERCISE APPARATUS

BIOLOGICAL TEST STRIP

POSITRON EMISSION TRANSAXIAL TOMOGRAPHY