Submarine pioneer John P. Holland was the first to apply for and receive patents on his successful submarine technology in the late 1800's. His designs and technology, though they've been advanced over the years, essentially remain the same in principle of design today.

A patent is a grant from a patent office, such as the United States Patent Office. "Patent Pending" is a phrase that an application for a patent has been filed and is in some stage in the process of obtaining a patent. Thus, a patent can be presently enforced while a patent that is merely pending is unenforceable but can mature into a patent that can be enforced. Once the pending patent matures, the patent owner can sue for back damages or reasonable royalties starting from the filing date of the patent.

You drag the word "submarine" itself onto the submarine. Then you wait for it to sink.

Victor G. Durham has written:

'The Submarine Boys' Lightning Cruise'

'The Submarine Boys and the Middies The Prize Detail at Annapolis'

'The Submarine Boys' Lightning Cruise (The Submarine Boys)'

'The Submarine Boys on Duty'

'The Submarine Boys and the Middies (The Submarine Boys)'

'The Submarine Boys and the Spies'