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| 1971 | L.S. Plush | | 1971 | E.R. Hahn | | 1972 | L.E. Gerlach | | 1972 | K.R. John | | 1972 | E.L. Mader | | 1973 | J.W. Mader | | 1978 | S.K. Biele | | 1978 | K.G. Semmler | | 1980 | W.F. John | | 1984 | G.K. Mattner | | 1987 | F.G. Boehm | | 1994 | M.J. Roesler | | 1994 | M.I. Gerhardy | | 1994 | R.E. Waechter | | 1994 | R.E. Gerlach | | 1998 | M.A. John | | 1998 | N. Hage | | 2001 | R.P. Gerhardy | | 2002 | L.K. Mattner | | 2004 | S. Kurtz | | 2006 | K.W.J. Boehm | | 2007 | S.R. Haswell | | 2007 | M.I. Mattner |
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