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How long is 351 milimeters?

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It's about nine-tenths as tall as a Bowling Pin.
In other words, 351 milimeters is 0.921 times the height of a Bowling Pin, and the height of a Bowling Pin is 1.09 times that amount.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.794 milimeters of 381 milimeters in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
It's about half as long as a Woman's Footstep.
In other words, 351 milimeters is 0.53 times the length of a Woman's Footstep, and the length of a Woman's Footstep is 1.9 times that amount.
(for healthy, middle-aged woman of average height; single step length)
It's about two-fifths as long as a Man's Footstep.
In other words, 351 milimeters is 0.44 times the length of a Man's Footstep, and the length of a Man's Footstep is 2.3 times that amount.
(for healthy, middle-aged man of average height; single step length)
It's about two-fifths as tall as Verne Troyer.
In other words, 351 milimeters is 0.43 times the height of Verne Troyer, and the height of Verne Troyer is 2.3 times that amount.
(1969-) (actor)
It's about two-fifths as tall as General Tom Thumb.
In other words, 351 milimeters is 0.39 times the height of General Tom Thumb, and the height of General Tom Thumb is 2.6 times that amount.
(a.k.a. Charles Sherwood Stratton) (1838-1883) (circus performer; height at death)
It's about one-third as tall as Kenny Baker.
In other words, the height of Kenny Baker is 3.1 times 351 milimeters.
(a.k.a. Kenneth George Baker) (1934-) (actor)
It's about three-tenths as tall as Hervé Villechaize.
In other words, 351 milimeters is 0.29 times the height of Hervé Villechaize, and the height of Hervé Villechaize is 3.4 times that amount.
(a.k.a. Hervé Jean-Pierre Villechaize) (1943-1993) (actor)
Hervé Villechaize, most famous for his role as Tattoo on the 1978-84 television series Fantasy Island, was an LP with a height of 1,200 milimeters. Villechaize's form of dwarfism, spondyloepiphyseal dysplasia-brachydactyly and distinctive speech (SED-BDS), is also known as "Tattoo dysplasia" or "Fantasy Island syndrome."