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Soviet Union's T-34/76 medium tank, how to tell the differences between the different models of T-34s

Note: These are not 100% certain rules, as there were variations from the factories and modifications made in the field.
T-34 Model 1940
Main armament mounted low in mantlet Identification of Soviet T-34/76 Model 1940, Armament Mounted low in mantlet
Short L/11 main armament Identification of Soviet T-34/76 Model 1940, Short main armament
Rounded front Identification of Soviet T-34/76 Model 1940, rounded front
One hatch , single periscope on left Identification of Soviet T-34/76 Model 1940, one hatch
T-34 Model 1941
Main armament mounted higher in mantlet Identification of Soviet T-34/76 Model 1941, Armament Mounted higher in matlet
Rounded front Identification of Soviet T-34/76 Model 1941, Rounded front
One hatch, 2 periscopes Identification of Soviet T-34/76 Model 1941, one hatch
Stowage box on right hand track guard  
T-34 Model 1942
Main armament mounted higher in mantlet Identification of Soviet T-34/76 Model 1942, Armament Mounted higher in matlet
Flat front Identification of Soviet T-34/76 Model 1942, flat front
Dual hatches Identification of Soviet T-34/76 Model 1942, dual hatches
Hull machine gun mounting  
T-34 Model 1943