Question: What weapon, designed by Aimo Lahti, was a descendant of the M-22 prototype and the KP/-26 production model?
Context: The "Sport" camera is the series production model of a prototype camera called Gelveta.  The Gelveta was designed and built by A. O. Gelgar between 1934 and 1935.  It is the earliest known 35mm SLR camera ever to be built, but fewer than 200 examples were made.  The actual launch date of the "Sport" is somewhat uncertain, however it must undoubtedly be one of the two earliest generally available SLR cameras using the 35mm film format, the other being the German Ihagee Kine Exakta, launched in 1936.  It was manufactured by the Soviet camera factory Gosudarstvennyi Optiko-Mekhanicheskii Zavod, The State Optical-Mechanical Factory in Leningrad.  GOMZ for short.  The camera name is engraved in Cyrillic on the finder housing above the lens: „Спорт“.  The manufacturer's prism logo in gold on black with the factory initials ГОМЗ (GOMZ) is shown behind a circular magnifying window on the top left camera front.  An estimated number of 16,000 cameras were made before Leningrad was besieged in September 1941 and suffered heavy damage.  The design concept was not continued later. The Suomi KP/-31 (Suomi-konepistooli or "Submachine-gun Finland", literally: "Machine-pistol Finland") was a submachine gun (SMG) of Finnish design used during World War II.  It was a descendant of the M-22 prototype and the KP/-26 production model, which was revealed to the public in 1925.  The "Suomi-konepistooli KP/-31" is often abbreviated to "Suomi KP". Aimo Johannes Lahti (April 28, 1896 – April 19, 1970) was a self-taught Finnish weapons designer.  Of the 50 weapons he designed, the best known is the Suomi M-31 SMG.  Other well-known weapon designs of his include the Lahti-Saloranta M/26 LMG, Lahti L-35 pistol, and Lahti L-39 anti-tank rifle.  Lahti also designed the 7,62 ITKK 31 VKT anti-aircraft machine gun and the 20 ITK 40 VKT anti-aircraft cannon. Voxan is a French motorcycle manufacturer established in Issoire, France, in 1995.  Initiated by Jacques Gardette, the project was to build the first French motorcycle company in the global market involving different partners.  Alain Chevallier designed the chassis, while Sodemo Moteurs focused on the engine.  The first prototype was shown in 1997, and the first production model released in 1999. The Maxim M/32-33 is a Finnish modification of the Russian M1910 Maxim, developed by Aimo Lahti in 1932.  The weapon was able to fire at the rate of 850 rounds/min, while the Russian M1910 and earlier Finnish M09-21 were capable of 600 rounds /min.  The reason was not only that Aimo Lahti was ordered to develop the weapon with a new metallic ammunition belt but also because of other improvements, such as accelerator mechanism and muzzle booster.  Other improvements had Maxim M/32-33's whole handle part were redesigned and installation point for optical sight was added. 7,62 ITKK 31 VKT or 7,62 mm VKT anti-aircraft machine gun was the primary anti-aircraft machine gun of the Finnish Army during World War II.  The weapon was designed by the Finnish gunsmith Aimo Lahti.  507 weapons were produced in two versions, 7,62 ItKk/31 VKT and an improved 7,62 ItKk/31-40 VKT, between 1933 and 1944. The Lahti-Saloranta M/26 (alternatively LS/26) is a light machine gun which was designed by Aimo Lahti and Arvo Saloranta in 1926.  The weapon was able to fire in both full automatic and semi-automatic modes.  Both 20-round box and 75-round drum magazines were produced, but the Finnish army seems to have only used the smaller 20-round magazine. The Lahti L-35 is a semi-automatic pistol designed by Aimo Lahti that was produced between 1935 and 1952.  Designed to be manufactured autonomously in Finland, the pistol was used by Finland throughout the Winter War and Continuation War.  Considered to be of high quality, the Lahti was well manufactured and worked reliably in cold conditions or when fouled.  The use of a bolt accelerator, an uncommon feature in a pistol, helped make the Lahti a reliable pistol. The Macchi M.41 was an Italian flying boat fighter prototype of 1927 designed and manufactured by Macchi.  Its production model, the M.41"bis", first flown in 1929, was in front line service from 1930 to 1938. 20 ItK 40 VKT or "20 mm dual anti-aircraft cannon model 1940 manufactured by VKT" was a Finnish light anti-aircraft gun designed by the Finnish gunsmith Aimo Lahti.  As the only multi-barrel 20 mm anti-aircraft gun 20 ItK 40 VKT was the most effective 20 mm air defence weapon used by the Finnish Army during World War II.  A total of 174 guns were built, used in training until the 1970s and kept in reserve until 1988.  The gun received the nickname "Vekotin" (gadget) from Finnish soldiers.  The nickname was reached by adding to the abbreviation of manufacturer, VKT.
Answer: Suomi KP/-31