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Class 4: Bonded yards or sheds for the storage of heavy and bulky 
imported merchandise. Warehouses of this class are used exclusively 
for the storage of heavy and bulky articles. The yards must be 
inclosed by substantial fences, not less than 12 feet in height, with 
entrance gates capable of being secured by customs locks. The 
collectors may send to such yards unclaimed or seized goods of the 
character above described. Stables or parts thereof may be bonded 
upon approval of the department for the storage of animals. 
Class 5: Bonded bins or parts of buildings or of elevators to be 
used for the storage of grain. The bonded portions must be separate 
from the rest of the building. 
Warehouses of class 4 or 5 may be bonded exclusively for the 
storage of goods imported by the proprietor thereof, in which case 
they are designated as ‘importers’ private warehouses.” 
Class 6: Warehouses for the manufacture in bond, solely for 
exportation, of articles made in whole or in part of imported materials 
or of materials subject to internal-revenue tax; and for the manu- 
facture for home consumption of exportation of cigars in whole of 
tobacco imported from one country. 
Class 7: Warehouses bonded for smelting and refining imported 
ores and crude metals for exportation or domestic consumption. 
Class 8: Bonded warehouses established for the purpose of cleaning, 
sorting, repacking, or otherwise changing in condition, but not 
manufacturing, imported merchandise, under customs supervision 
and at the expense of the proprietor. Such merchandise may be 
withdrawn for exportation, without payment of duties, or for con- 
sumption upon the payment of duties accruing thereon in its condition 
at time of withdrawal. The scouring or carbonizing of wool in such 
bonded warehouse is not considered a process of manufacture. 
Cartage and lighterage.—Cartage of merchandise in customs custody 
is of two kinds—(a) Government cartage, which must be done by a 
licensed customhouse cartman under contract for that purpose, and 
(b) importers’ cartage, which may be done by any licensed custom- 
house cartman. The cartage of package designated for examination 
at the appraisers’ stores or taken possession of for other reasons 
is done at the expense of the importer by a cartman licensed by the 
collector. Importers must designate on the entry of bonded mer- 
chandise the bonded warehouse in which they desire their merchandise 
deposited and the bonded cartman by whom they wish it to be con- 
veyed. An adequate system of receipts covering the transfer of 
merchandise between docks and bonded warehouses is provided for 
by the customs regulations. Cartmen give receipts to the importing 
vessel for all packages or merchandise in bulk delivered to them, and 
are held liable under their bonds for its prompt delivery and sound 
condition unless specially relieved of responsibility. 
FOREIGN TRADE ZONES