Maryland Commercial Law Section 9-510

      (a)      A filed record is effective only to the extent that it was filed by a person that may file it under § 9-509.

      (b)      A record authorized by one secured party of record does not affect the financing statement with respect to another secured party of record.

      (c)      A continuation statement that is not filed within the six-month period prescribed by § 9-515(d) is ineffective.