THERMOTREX CORP

Q: Apr 1 2000

FY: Oct 2 1999

Q: Jan 1 2000

FY: Oct 2 1999

Q: Jul 3 1999

Q: Apr 3 1999

FY: Oct 3 1998

Q: Jan 2 1999

FY: Oct 3 1998

FY: Oct 3 1998

Q: Jul 4 1998

Q: Apr 4 1998

Q: Jan 3 1998

FY: Sep 27 1997

Q: Jun 28 1997

Q: Mar 29 1997

FY: Sep 28 1996

Q: Dec 28 1996

FY: Jan 24 1997

FY: Sep 28 1996

2,7

5,7

2,7

5,7

5,7

5,7

5,7

5,7

5

5,7

5,7

1

1

Certification of termination of registration of a class of securities (Section 12(b))

Written communication about a business combination transaction (Rule 425)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Post-effective amendment to a registration statement

Post-effective amendment to a registration statement

Post-effective amendment to a registration statement

Registration of Securities on Exchange

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

THERMO ELECTRON CORP

NICHOLAS CO INC /WI

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

NICHOLAS CO INC /WI

THERMOTREX CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

THERMO ELECTRON CORP

PELLEGRINO ANTHONY J

THERMO ELECTRON CORP