Any person licensed as a commission merchant, dealer, or broker, in the manner prescribed in this chapter, may apply for and secure a license in any or all of the remaining such classifications upon payment of an additional fee of twenty-five dollars for each such additional classification: PROVIDED, That the applicant's principal license shall be in that classification requiring the greatest license fee. Such applicant shall further comply with those parts of this chapter regulating the licensing of the other particular classifications involved.
RCW 20.01.060