Nikolai Grigorievich Kovalevsky

Follow

Person

Dnepropetrovsk, SU

People

Patents Grantslast 30 patents

Information Patent Grant
Mill for plugging tubes and taking them off plug
- Patent number 3,930,394
- Issue date Jan 6, 1976
- Pavel Ivanovich Orro
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...