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"My 78 year old uncle who is the sole remaining direct desendent to my grandfather who sang & talked on most of the recordings was very surprised and had forgotten about the records...He (my uncle) actually was the one who recorded most of the records...He did shed a tear or two hearing his father & mother for the first time in 35 or more years ..."

Mean free path

The average distance that sound waves travel between successive reflections in an enclosure.