TsKB-60 explained

The TsKB-60 designation, from the Tsentral'noye Konstruktorskoye Byuro (TsKB), was applied to several different Russian military aviation development engineering projects, including a developed Il-2, a twin-engined attack aircraft and a twin engined bomber.[1]

References

  1. Book: Gordon . Yefim . OKB Ilyushin . 2004 . Midland . Hinkley . 978-1-85780-187-3 . Komissarov . Dmitry . Komissarov . Sergey.