It's because they was dividing Indian society groups based on rank, wealth, or occupation.
1. The dynamo-powered torch. Power was always a problem in WW2 and in 1943 in occupied Netherlands the Philips company built a dynamo-powered flashlight for the troops. powered by a handle on top, light was generated by squeezing the handle on top.
Grains, oil, and textiles were native to Babylonia while they exchanged timber, wine, precious metals, and stones. (merchants received in exchange for these items)
A) David
Jerusalem has stood at the center of the Jewish people's national and spiritual life since King David made it the capital of his kingdom in 1003 BCE. The city remained the capital of the Davidic dynasty for 400 years until the kingdom was conquered by the Babylonians.