Cummins ISB and QSB Engine Parts. Based on the Cummins B Series, the ISB engine was launched in 1998 and is available in 4 and 6 inline cylinder models. Design innovations include a 24-valve setup and the Interact electronic engine management system, both contributing to increased fuel efficiency and meeting emission regulations.
From 1920 to 1929, stocks more than quadrupled in value â not because of fundamentals such as corporate production and profits, but rather fueled by rampant speculation. The economic house of cards came to a screeching halt on Black Tuesday, October 29, 1929 when the bubble burst.
There were several major causes of the Great Depression in the United States. 1. Unequal distribution of wealth. There was not a large middle class. While wages were rising foâ¦r the majority of workers, they were not keeping pace with the increase in the cost of living or the wealth in the hands of the industrialists and others in the upper income classes.