A certificate as provided for by section 4 of the act shall be issued to the interested person in duplicate covering naval stores examined at his request, and additional copies, if desired, may be obtained from the inspector. The kind of certificates issued are as follows:

(a) Turpentine analysis and classification certificate.

(b) Turpentine field classification certificate.

(c) Rosin classification and grade certificate.

(d) Rosin grade and weight certificate.

(e) Loan and sale certificate for United States graded rosin.

(f) Classification and grade certificate for rosin in small containers.