"...execution of complete trials was impossible for the following reasons:
- NIPSVO does not have a T-38, for which comrade Polyubin's mount was built (feed system, ammunition racks, toolkit, etc).
- The provided 7.62 mm modernized tank machinegun mod. 1940 was very worn out, the logbook and toolkit were missing. By the time the shortened trials program was completed, the machinegun was inoperative.
- Comparison of the TP and TP-1 sight and subsequent choice of the superior model (as per your instruction) was impossible, since only the TP sight arrived."