| 1946 |
Drop forging factory was founded, started to sell dropforged tools |
| 1960 |
Moved the drop forging factory to Sanjo-city area |
| 1960 |
Start drop forging process of general hand tools |
| 1973 |
Established new factory at Shitada area |
| 1973 |
Established the limited company named "Kawahiro dropforging factory" |
| 1973 |
Install the Medium frequency induction heater for dropforging heating process |
| 1978 |
ARM Sangyo Co.,LTD was established |
| 1979 |
Started to manufacture and sell hand tools, such as Bolt Cutters, Pliers |
| 1981 |
Get the approval of Japan Industrial Standard factory |
| 1981 |
Started exporting business to various countries |
| 1988 |
Hand Swager, Oval Sleeves were released |
| 1989 |
The new factory was built |
| 1991 |
Series of Pipe Wrench were released |
| 1994 |
Soft Jaw manufacturing department was established and started manufacturing and selling |
| 1999 |
Cordless hydraulic tools division was established and the sales started |
| 2004 |
Electric Power tools were invented following to cordless ones, then introduced to the market |
| 2007 |
Got the certificate of New Japan Industrial Standard |
