GOST 28999-1991 Inductor and transformer cores for telecommunication. Part 2. Blank detal specification magnetic oxide cores for inductor application. Assessment level A
GOST 28900-1991 Guide to the specifications of limiting values for physical imperfections of parts of ferromagnetic oxides
GOST 28997-1991 Inductor and transformer cores for telecommunication. Part 1. Generic specification
GOST 28998-1991 Inductor and transformer cores for telecommunication. Part 2. Sectional specification magnetic oxide cores for inductor applications
GOST 28999-1991 history
1991GOST 28999-1991 Inductor and transformer cores for telecommunication. Part 2. Blank detal specification magnetic oxide cores for inductor application. Assessment level A