Latvian electrical chain mortiser S-474A. Made in 1971. Tech specifications: Max slot size: 20-55 mm (0.79-2.19"). Maximum mortise depth: 160mm (6.3"). Motor power: ~0.8 kW (1.07 h.p.). Supply voltage: ~220 V (three-phase). Weight - 13 kg (28.6 lb). Tungsten carbide chain teeth