Aarau ä´rou [key], town (1993 pop. 15,900), capital of Aargau canton, N Switzerland, at the foot of the Jura Mts. and on the Aare River. Manufactures include bells, mathematical instruments, electrical goods, shoes, and other products. Aarau was founded c.1250; it was the temporary capital (1798) of the Helvetic Republic .
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