多选题 Historians, particularly those investigating the history of women, now seriously question this assumption of transforming power. They conclude that such dramatic technological innovations {{U}}as the spinning jenny, the sewing machine, the typewriter, and the vacuum cleaner have not{{/U}} resulted in equally dramatic social changes in women's economic position or in the prevailing evaluation of women's work. The employment of young women in textile mills during the Industrial Revolution was largely an extension of an older pattern of employment of young, single women as domestics. It was not the change in office technology, but rather the separation of secretarial work, previously seen as an apprenticeship for beginning managers, from administrative work that in the 1880's created a new class of "dead-end" jobs, thenceforth considered "women's work". The increase in the numbers of married women employed outside the home in the twentieth century had less to do with the mechanization of housework and an increase in leisure time for these women than it did with their own economic necessity and with high marriage rates that shrank the available pool of single women workers, previously, in many cases, the only women employers would hire.
The author mentions all of the following inventions as examples of dramatic technological innovations EXCEPT the ______.

• A. sewing machine.
• B. vacuum cleaner.
• C. typewriter.
• D. telephone.
• E. spinning jenny.