EX-21 3 exhibit21subsidiaries10k20.htm EXHIBIT 21 SUBSIDIARIES
Exhibit 21
SUBSIDIARIES OF REGISTRANT
MFRI Holdings (B.V.I) Ltd (British Virgin Islands)
Midwesco Filter Resources, Denmark A/S (Denmark)
Midwesco Filter Resources, Inc. (Delaware corporation)
MM Niles, Inc. (Delaware corporation)
Perma-Pipe, Inc. (Delaware corporation)
Perma-Pipe Canada, Inc. (Delaware corporation)
Perma-Pipe Canada, LTD. (Canada)
Perma-Pipe India Pvt. Ltd. (India)
Perma-Pipe International Co. LLC (Delaware corporation)
Perma-Pipe Middle East FZC (United Arab Emirates)
Perma-Pipe Oil Field Services LLC (United Arab Emirates)
Perma-Pipe Saudi Arabia, LLC (Kingdom of Saudi Arabia)