"Report on experimental work at factory #100 for the first 10 days of June, 1943
Most effort at the factory was directed towards production and assembly of IS-3 components according to altered blueprints and continuation of factory trials of IS-1 and IS-2 tanks, bringing the total distance travelled to 2000 km.
Production and assembly of IS-3 components
- The factory #100 production plant received altered blueprints on May 25th, 1943.
- All components are in production aside from those that cannot be produced at factory #100: the hull, F-85 gun mount, turret, commander's cupola. The aforementioned parts are being produced at factory #200. The final drive and a portion of the drive sprocket are being produced at the Kirov factory.
- Most components for one vehicle have been completed and are being finished at factory #100, with the exception of the cooling fan, ammunition racks, and individual parts of other assemblies.
- The assembly of the drive sprocket and lower suspension has started.
- The gearshift gate, idler with tension mechanism, radiator, main friction clutch, speedometer control rod, planetary turning mechanism, gearbox, control rods, and brake are assembled.
- Casting and forging work is finished.
- Assembly of the hull and turret at factory #200 is being delayed due to organizational reasons and production issues. Factory #200 promises to complete assembly by June 15th, 1943.
- F-85 artillery systems have not yet been received.
The Kirov factory, which is scheduled to produce two IS-3 tanks, is receiving three sets of parts (one set to be used for spares)."