DETECTION SYSTEMS INC

Q: Sep 30 2000

Q: Jun 30 2000

FY: Mar 31 2000

FY: Mar 31 2000

Q: Dec 31 1999

Q: Sep 30 1999

Q: Jun 30 1999

FY: Mar 31 1999

Q: Dec 31 1998

Q: Sep 30 1998

Q: Jun 30 1998

Q: Sep 30 1997

Q: Dec 31 1997

FY: Mar 31 1998

FY: Mar 31 1998

Q: Sep 30 1997

Q: Dec 30 1997

Q: Feb 18 1998

Q: Sep 30 1997

Q: Jun 30 1997

5

5

5

5

9

9

5

Current report pursuant to Section 13 or 15(d) (amendment)

2,7

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

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

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

Registration statement under Securities Act of 1933

No description available

No description available

No description available

Registration statement under Securities Act of 1933

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

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional proxy soliciting materials filed by a non-management party

Additional proxy soliciting materials filed by a non-management party

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional proxy soliciting materials filed by a non-management party

No description available

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional proxy soliciting materials filed by a non-management party

No description available

Additional proxy soliciting materials filed by a non-management party

Additional proxy soliciting materials filed by a non-management party

No description available

Additional proxy soliciting materials filed by a non-management party

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

No description available

DIMENSIONAL FUND ADVISORS INC

BOSCH SECURITY SYSTEMS CORP

BOSCH SECURITY SYSTEMS CORP

DETECTION SYSTEMS INC

LEDERER DAVID B

KOSTUSIAK KARL H

DETECTION SYSTEMS INC

BOSCH SECURITY SYSTEMS CORP

DETECTION SYSTEMS INC

BOSCH SECURITY SYSTEMS CORP

LIONHEART GROUP INC

BOSCH SECURITY SYSTEMS CORP

ULTRAK INC

BOSCH SECURITY SYSTEMS CORP

BOSCH SECURITY SYSTEMS CORP

DETECTION SYSTEMS INC

BOSCH SECURITY SYSTEMS CORP

LEDERER DAVID B

KOSTUSIAK KARL H

BOSCH SECURITY SYSTEMS CORP