1982: https://www.yojoe.com/action/82/
1983: (excluding the '82 swivel arm updates) https://www.yojoe.com/action/83/
1984: https://www.yojoe.com/action/84/
1985: https://www.yojoe.com/action/85/
1986: https://www.yojoe.com/action/86/
1987: https://www.yojoe.com/action/87/
1988 or higher