WAHLCO ENVIRONMENTAL SYSTEMS INC

Quarterly Report for period ending 1998-09-30

Notice under Rule 12b25 of inability to timely file all or part of a form 10-Q or 10-QSB for period ending 1998-09-30

Quarterly Report for period ending 1998-06-30

Quarterly Report for period ending 1998-03-31

Quarterly Report for period ending 1997-09-30

Notice under Rule 12b25 of inability to timely file all or part of a form 10-Q or 10-QSB for period ending 1997-09-30

Quarterly Report for period ending 1997-06-30

Quarterly Report for period ending 1997-03-31

Notice under Rule 12b25 of inability to timely file all or part of a Form 10-K, 10-KSB, or 10-KT for period ending 1996-12-31

Quarterly Report for period ending 1996-09-30

Notice of termination of registration of a class of securities under Section 12(b)

Annual Report with disclosure of delinquent filers

Annual Report with disclosure of delinquent filers

Annual Report with disclosure of delinquent filers

Annual Report with disclosure of delinquent filers

HEMSLEY MAARTEN D: Statement of changes in beneficial ownership of securities

WES ACQUISITION CORP: Major Shareholders

HUNN PAUL H: Statement of changes in beneficial ownership of securities

SOUTHAM BARRY J: Statement of changes in beneficial ownership of securities

DEWINTER A NOEL: Statement of changes in beneficial ownership of securities

BEAL C STEPHEN: Statement of changes in beneficial ownership of securities

STEADMAN DAVID R A: Statement of changes in beneficial ownership of securities

HEMSLEY MAARTEN D: Statement of changes in beneficial ownership of securities

PLAUMANN MARK L: Statement of changes in beneficial ownership of securities

FERRIGAN JAMES J: Statement of changes in beneficial ownership of securities

Prospectus filed pursuant to Rule 424(b)(5)

General form of registration statement for all companies including face-amount certificate companies

General form of registration statement for all companies including face-amount certificate companies

Initial registration statement for securities to be offered to employees pursuant to employee benefit plans

Definitive proxy statement relating to a merger, acquisition, or disposition

Preliminary revised proxy soliciting materials

Preliminary proxy statement not related to a contested matter or merger/acquisition

Preliminary proxy statement not related to a contested matter or merger/acquisition