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Wikipedia每日一图（#August 28, 2025）https://ift.tt/4XxuG5y TDK tape head cleaner cassette "HCL-11" made of clear hard plastic. The plastic is birefringent and demonstrates internal stress as coloured patterns (photoelasticity) when photographed using cross-polarisation. Invented by Lou Ottens and his team at the Dutch company Philips, the Compact Cassette was released on this date in August 1963.. 了解更多 . #Wikipedia每日一图