Parliament of Australia
From 1901 to 1949, the House consisted of either 74 or 75 members (the Senate had 36). Between 1949 and 1984, it had between 121 and 127 members (the Senate had 60 until 1975, when it increased to 64). In 1977, the High Court ordered that the size of the House be reduced from 127 to 124 members to comply with the nexus provision. In 1984, both the Senate and the House were enlarged; since then the House has had between 148 and 150 members (the Senate has 76).
1964 Australian Senate election
Elections were held on 5 December 1964 to elect members to half of the 60 seats in the Australian Senate. There was no accompanying election to the House of Representatives, as Robert Menzies had called an early House-only election the previous year. As with the previous Senate election, the Coalition held exactly half of the seats in the chamber; the Democratic Labor Party and independent senator Reg Turnbull held the balance of power.