Grover-Loening built a small amphibian flying-boat XS2L for U.S. Navy in 1931. Delivered XSL-2 experimental submarine-borne version in 1933.
Grover-Loening built a small amphibian flying-boat XS2L for U.S. Navy in 1931. Delivered XSL-2 experimental submarine-borne version in 1933.