  
 
|
|
|
|
Certificates
|
No.
|
Date
|
Patent) Time Division Shift Broad Band-
pass Amplifier Circuit
|
1995-0067485
|
Dec. 29, 1995
|
| Patent) Signal Repeater Equipment |
1998-0011864
|
Oct. 10, 2000
|
(Utility Model Right) Anti-disaster
Facility
with Emanation Coaxial Cable in Tunnel
|
027989
|
May 06, 1994
|
| (Design Right) Insulator
|
94-026558
|
May 16, 1996
|
| (Design Right)
Insulator
|
94-026557 |
May 16, 1996
|
|
|
|
