TNAG-2890-FCO40-4162-Reform-and-localisation-of-the-Hong-Kong-Patent-System-1993 — Page 141

180

160

140

120

100

80

60

40

20

0

1

TABLE E (Cont.)

Patents registered in Hong Kong 1980 1990

2

3

Class E

เก

5

6

21

01

02

Section E Fixed Constructions

Construction of roads, railways and bridges

Hydraulic engineering; Foundations; Soil shifting

03

Water supply; Sewerage

04

Building

05

Locks; Keys; Window and door fittings; Safes

06

se

21

Doors; windows; shutters or roller blinds in general; Ladders Mining

69