Excuse, the main information is only in Russian. Some data on production
Magnetic Compass UKPM-M1, UKPM-M2, UKPM-M3 Magnetic Compass UKPM-M4, UKPM-M7 Induction log IEL-3 Magnetic Compass KMS90, KMS90-1 Magnetic Compass KMS55 Magnetic Compass KM40 Navigation inventories