| 1951 | SeoJin Instech Level Transmitter SDT-420 | |
| 1952 | SeoJin Instech Level Transmitter SGL | |
| 1953 | SeoJin Instech Level Transmitter ST-600 | |
| 1954 | SeoJin Instech Level Switch SDS-3000 | |
| 1955 | SeoJin Instech Level Switch SC5/SB3 | |
| 1956 | SeoJin Instech Level Switch SPS/SR7 | |
| 1957 | SeoJin Instech Level Switch SCAP | |
| 1958 | SeoJin Instech Level Switch SRF | |
| 1959 | SeoJin Instech Level Switch SVL | |
| 1960 | SeoJin Instech Level Switch SPT/SPL | |
| 1961 | SeoJin Instech Level Switch SFP | |
| 1962 | SeoJin Instech Level Switch SMC-7 | |
| 1963 | SeoJin Instech Level Switch SMC | |
| 1964 | SeoJin Instech Level Switch SHM-200 | |
| 1965 | SeoJin Instech Level Switch SHM-100 | |
| 1966 | SeoJin Instech Level Switch SFM | |
| 1967 | SeoJin Instech Level Switch SFS-2 | |
| 1968 | SeoJin Instech Level Switch SF | |
| 1969 | SeoJin Instech Level Switch STT | |
| 1970 | SeoJin Instech Level Switch SH(SEC) | |
| 1971 | SeoJin Instech Level Switch SQ | |
| 1972 | SeoJin Instech Level Switch ST-POINTS | |
| 1973 | SeoJin Instech Level Switch SOL | |
| 1974 | SANDBLAST FILM & CHALKBOARD FILM – SPECIAL FILMS | |
| 1975 | Sand Bean Stone Paint | |
| 1976 | SSH-F-60 & SSH-F-120 - sliding gear for timber door up 60 & 120kg | |
| 1977 | SSH-F-300 - Heavy duty sliding gear for timber door up to 300kg | |
| 1978 | SSH-F-120 - medium duty sliding gear for timber door up to 120kg | |
| 1979 | SSH-F-SB-80 - sliding system for timber with single soft brake | |
| 1980 | SSH-F-SC-80 - self-closing sliding gear for timber door up to 80kg | |