METODO E DISPOSITIVO PER ESEGUIRE UN FORO IN UNA ROCCIA.

申请公布号：IT8920769(D0)

申请号：IT19890020769

申请日期：1989.06.02

申请公布日期：1989.06.02

申请人：

OY TAMPELLA AB

发明人：ROLF STROM;VEIJO NURMI;RISTO WISAKANTO

分类号：E21B19/24;E21B15/04;E21B44/00

主分类号：E21B19/24

Stabilization of polyolefins

6-methylene-3-oxo-delta4 steroids and process for preparation of same

Method of improving the grade of byproduct gypsum obtained in carrying out a wet process for production of phosphoric acid

Method of using a recording device with mechanical milkers

Steam generator by-pass systems for a steam-electric generating plant

Method of inhibiting the sprouting of potatoes

Luminaire

Novel salt of hydroxocobalamine

Magnetic disc storage device

Transmission apparatus having a checking device

Crystal mount

Low noise electronic differentiator

Motor vehicle brake system

Device for the magnetic recording of television pictures

Polymeric organic silicon compound

Electronic monitoring means

R. m. s. meter using amplifier with controlled feedback

Electrical panelboard

Marginal monitoring device