Stock Photo - Apr. 26, 1960 - Ultra short wave receiver replaces the guide : A modern way of guide was tested on April 25th in the Heidelberg Castle. The visitors get a small ultra-short wave receiver with earphone with a programme of words , music etc lasting for 45 minutes. The installation makes it possible to send on 6 channels many programmes and on different languages, OPS: a guide in historical dress introducing the instruments to a visitor at Heidelberg Castle. (Credit Image: © Keystone Press Agency/Keystone USA via ZUMAPRESS.com)

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