Military calculation board for Russian aircraft

Lot 1143 limit € 30

in Czech, double-sided rotary board JEDNOTNY REZIM, for setting and reading values for the MIG 15, MIG 19, MIG 21, IL-14, IL-28, SU - 7b, L-29, L-200, MI-4 ( including fighter planes and bombers), processed by hand, signs of age and wear, probably from the 1950s/1960s