Contact point

v.1-4 1924-1927; v.5-7 1927-30; v.8-9 1930-32; v.8-10 1930/33; v.9-11 1931-1934; v.10-11 1932-34; v.12-13 1934-36; v.12-14 1934-1937; v.14-15 1936-38; v.14-16 1936/39; v.15-7 1937-1940; v.16-17 1938-40; v.18-19 1940-42; v.18-21 1940-1944; v.20-22 1942/44; v.20-21 1942-44; v.22-23 1944-45; v.24-25 1945-47; v.22-6 1944-1948; v.26-27 1947-49; v.27-30 1948-1950; v.28-29 1949-51; v.30-31 1951-53; v.32-33 1953-55; v.33 1954-1955; v.34-35 1955-57; v.34-36 1955/58; v.36 1957-1958; v.36-37 1958-59; v.38 1959-60; v.39 1960-61; v.40 1961/62; v.41 1962/63; v.42 1963/64; v.43 1964/65; v.44 1965/66; v.45 1966/67; v.46 1967/68; v.47 1968/69; v.48 1969/70; v.59 no.1-2 yr.1981; v.59-61 1981/1983:inc.; v.62 yr.1984; v.63:no.2-4 1985:Spring/Fall; v.65 yr.1987; v.66 no.2-4 yr.1988; v.67 no.1-2 yr.1989; v.68 no.2 yr.1990