The "Pirate" design is in the public domain for the following legal reasons:
Original Publication: Designed by Riley Wooten and published in 1955.
The 28-Year Rule: Under the 1909 Copyright Act, the initial copyright term was 28 years (1955 + 28 = 1983).
Lack of Renewal: No formal renewal was filed in the 28th year by the original creator or publisher; the design entered the public domain in 1983.
Archive Source: These parts are drafted for compatibility with the historical technical drawings that are available free of charge on public repositories.
