original_query: What device was introduced in the 1980s that produces the sound of flushing water without actually flushing?
query: What device was introduced in the 1980s that produces the sound of flushing water without actually flushing?
answer: The Otohime, a device that produces the sound of flushing water without actually flushing, was introduced in the 1980s to address the issue of women flushing toilets continuously to mask the sound of urination.