Testing of the gas generator of the Dekolenkov system on the Kletrak tractor. The tractor is carrying the logs. Gas generators on a tractor (the test is carried out by the timber industry institute). Leningrad region. Sowing flax from an airplane at the Lomy state farm. The use of foundation slabs in the construction of a metallurgical plant in Magnitogorsk (invention of engineer Tishchenko). Swedish machine for bundling logs into bundles. Blockstat on timber-smelting operations in Karelia. USA. Design features of a vertical garage.