List of keelboat classes designed before 1970

Columns: Year | Name | Rule
1904 | Windermere 17s | 1906 | 6.5 Metre | Jauge chemin de fer | 1907 | 12 Metre | International rule | 1907 | 15 Metre | International rule | 1907 | 19 Metre | International rule | 1907 | 23 Metre | International rule | 1907 | 6 Metre | International 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