List of keelboat classes designed before 1970

Columns: Year | Name | Rule
1907 | 7 Metre | International rule | 1907 | 8 Metre | International rule | 1908 | 22m² Skerry cruiser | Square meter rule | 1908 | 30m² Skerry cruiser | Square meter rule | 1908 | 45m² Skerry cruiser | Square meter rule | 1908 | 55m² Skerry cruiser | Square meter rule | 1912 | 38m² Skerry cruiser | Square meter rule

Example questions:
For the keelboat class used in 1912 , most are yachts made out of what material ? | How many boats have survived until this day for the last class that used the international rule for keelboats ? | What is the earliest year the rule originating from Sweden was used for keelboats ? | What is the year used for the keelboat class where boats are not identical but are all designed to meet specific measurement formula ?

Answers:
wooden | 177 | 1908 | 1906