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H. J. L. Struycken was a Dutch otolaryngologist, phonetician, and acoustician. After studying medicine in Groningen, in 1893 he started working at the Voorburg psychiatric hospital near Vught, where he attempted to distinguish psychiatric conditions from neurological speech disorders. His interest in phonetics and acoustics took Struycken to France and Germany, to visit clinics and approach instrument makers who could produce tuning forks for him to use in his clinical research.

1896
1950
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Ut₁ - Re₁: Re₁ 5:6”. 153,6 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Mi₁ 5:6”. 153,6 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Mi₁ 4:5”. 160 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Fa₁ 3:4”. 170,7 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Mi₁ - Fa₁: Fa₁ 5:7”. 179,2 Vs.
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Koenig, Rudolph. n.d. “Tuning-Fork By Dr. R. König: Sol₁ - La₁: La₁ 3:5 ”. 192 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Sol₁ - La₁: Sol₁ 2:3”. 197 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Sol₁ - La₁: Sol₁ ”. 204,8 Vs.
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Koenig, Rudolph. n.d. “ Tuning-Fork By Dr. R. König: Sol₁ - La₁: La₁ 213,3 Vs”.