Sec. 21.21  Inconsistent or conflicting applications.

    While an application is pending and undecided, no subsequent 
inconsistent or conflicting application may be filed by the same 
applicant, the applicant's successor or assignee, or on behalf or for 
the benefit of the same applicant, the applicant's successor or 
assignee.
[ 44 FR 60534 , Oct. 19, 1979, as amended at  52 FR 37779 , Oct. 9, 1987]