The Celts chop wood 15% faster due to their civilization bonus. As a consequence, they have the fastest wood-chopping in the game, despite lacking access to this technology. Similarly, the Armenians get +28% effect from the previous two technologies, instead of the regular +20% due to their civilization bonus, which means that with Bow Saw, they chop 13.77% faster than other civilizations with Bow Saw, compensating for the lack of this technology.
Neither civilization with Mule Carts has Two-Man Saw.
History[]
“
The large two-man saw allowed two men to work together taking down a tree and increased the productivity of both. One man pulled the saw toward him with both hands and cut the tree. The second man rested but kept his hands on the saw. When the first man finished his pull, the second man pulled the saw back and the first man rested. The two-man saw cut with each back and forth motion and had big teeth and cut deeply, bringing trees down in quick time. Because each operator could use two hands when pulling, they could handle the large size and pull.