SCHEDULE 13G - 5-10-94 - MFRI INCORPORATED

Company

Perma-Pipe International Holdings, Inc.

Filed

May 6, 1994

Accession Number

0000315066-94-001144

A Schedule 13G is filed when a passive investor acquires more than 5% of a company's shares without intent to influence control. Learn more about SC 13G filings →