(7) Wrecked vessels purchased by citizens and repaired in American shipyards on proof that the repairs are equal to three times the appraised salved value; this is a special permission which is a dead letter except as to the coastwise trade, as wrecks can now be admitted to registry for foreign trade regardless of the amount of repairs;
(8) Vessels for foreign trade wherever built, wholly owned by citizens of the United States;
(9) Vessels purchased, chartered or leased from the Shipping Board by citizens of the United States.
Barges, lighters and other boats provided with sails or internal motive power, if falling within these classifications, are entitled to documents, as also barges and boats without sails or internal motive power engaged in the Canadian trade or employed upon the marine waters of the United States or engaged in the carriage of passengers.
The following classes of vessels are not within the provisions of the registry laws and therefore require no documents:
(1) Boats or lighters not masted, or if masted and not decked, employed in the harbor of any town or city and not carrying passengers.
(2) Barges or canal boats or boats without sails or internal motive power employed wholly upon canals or on the internal waters of the state and not engaged in trade with contiguous foreign territory and in carrying passengers;
(3) Barges or boats without sail or motive power, plying on inland rivers or lakes of the United States, also not engaged in trade with contiguous foreign territory and in carrying passengers;
(4) Vessels plying waters wholly within the limits of the state having no outlet into a river or lake on which commerce with foreign nations or among the states can be carried on.