146 



6 



1 years after that date, comply witli the provisions of Annex C 



2 to the convention if — 



3 " (1) the delivery of the tanker is after January 1, 



4 1977; or 



5 "(2) the delivery of the tanker is not later than 



6 January 1, 1977, and the huilding; contract is placed 



7 after January 1, 1972, or in cases where no building 



8 contract has previously been placed, the keel is laid or 



9 the tanker is at a similar stage of construction, after 



10 June 30, 1972. 



11 " (c) A tanker required under this section to be con- 



12 structed in accordance with Annex C to the convention 



13 and so constructed shall carry on board a certificate issued 



14 by the Secretary attesting to that compliance. A tanker 



15 which is not re<iuired to be constructed in accordance with 



16 x\nnex C to the convention shall carry on board a certificate 



17 to that effect issued by the Secretary, or if a tanker does 



18 comply with Annex C though not required to do so, she may 



19 carry on board a certificate issued by the Secretary attest- 



20 ing to that compliance. Tankers under the flag of the United 



21 States are prohibited from engaging in domestic or foreign 



22 trade without an ap])ro])riate certificate issued under this 



23 section. 



24 "(d) Certificates issued to foreign tankers pursuant to 



25 the convention by other nations ])arty thereto shall be 



