Shpital'nyi-Vladimirov Aviatsionnaya Krupnokalibernaya - large caliber aircraft gun designed by B.G. Shpital'nyi and S.V. Vladimirov.
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Appeared in 1935, but seems not to be widely used. The Berezin UB designs had already been selected for large-scale production and parallel production of two guns of similar performance was not desirable. The Yatsenko I-28 fighter prototypes are reported to have been equipped with two of those guns.