| Inventor |
Invention |
**Mr. Y.T. LEUNG**
辩 模 紈 ネ
|
**(irrigation work) New type of Drainage & Watering Device **
( ) 穝 Α 逼 拈 杆 竚
|
|
Mr. Michael TONG
|
Automatic Insulation Device for Preventing Backflow of Gas Containing Bacteria and Poisonous Pollutants
|
|
Mr. LO Wai Hon
|
Method of manufacturing Various Marble Glass-Fibre Board
with Both Side
|
| Mr. LEE Wang |
Wave Generator
|