Curtiss K-12 V-12 engine (A19710907000). National Air and Space Museum collection
Dane A. Penland
<a rel="nofollow" class="external free" href="https://airandspace.si.edu/collection-objects/curtiss-k-12-v-12-engine/nasm_A19710907000">https://airandspace.si.edu/collection-objects/curtiss-k-12-v-12-engine/nasm_A19710907000</a>