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.
Although a common belief is that the Great Depression was triggered by the 1929 crash of the stock market, the stock market in 1929 had reached record fundamental valuations in spite of deteriorating economic conditions such as rising unemployment, overproduction (excess capacity), underconsumption and high debt.