Brevet
Brevets Union soviétique 1992

- Patent:SU1717333 07.03.1992 Elmir A. Ajzuppe Vladimir G. Sechkin Vnii Razrabotki Ekspluatatsii : Planimeter for mechanical wrench
- Patent:SU1762106 15.09.1992 Evgenij A. Korzhavin Novosib Nii Aviat T Organizats : Planimeter for computing area on topographic map