The teaching clock may belong to A0334 12 in A0334 "Special Instruments" (including special instruments for teaching mathematics, measuring instruments for demonstration and special instruments for teaching) under "Special Equipment" in the Classified Catalogue of Government Procurement Projects (No.20189). Aerodynamic experiments instruments for teaching, astronomical and meteorological experimental instruments for teaching, aviation, aerospace and navigation experimental instruments for teaching, thermal instruments for electromechanical experiment teaching, psychological instruments for teaching, chemical analysis and chemical instruments for mathematics, physiological instruments for teaching, geographical instruments for teaching, audio-visual instruments for teaching, instruments for teaching technical basic courses, computer teaching instruments for mathematics, and others.