| 1948 |
Founded by Jin-ichi Kohara, first president. Provided machinery repair service, and manufacturing of hand drilling machines and grinders. |
| 1950 |
Shifted to manufacturing of drum pump (SB-25) and gear pump (GC-25).
SB-25 
GC-25 |
| 1966 |
Developed fill pump and "High Liter Pump" (LP-32).
LP-32 |
| 1968 |
Developed pump for solvents. |
| 1970 |
Developed "Big Auto Pump" (PP-25).
PP-25 |
| 1971 |
Developed GL pump and FS pump (GL-20).
GL 
GL-20 |
| 1972 |
Developed heavy-duty fill pump "Oil master", winch "Ecarl"(REL).
REL |
| 1974 |
Launched engine pump (SE-50L).
SE-50L |
| 1975 |
Launched plastic siphon pump (PH-10).
PH-10 |
| 1980 |
Launched submersible pump "Pondy" (SM-20).
SM-20 |
| 1981 |
Launched engine trash pump (KTR-100).
KTR-100 |
| 1983 |
Launched manual sprayer "Mister Auto" (HS-401).
HS-401 |
| 1984 |
Launched seawater submersible pump "Marine Pet" (BL-2524N).
BL-2524N |
| 1989 |
Launched winch "Mini-Carl" (RED-2012).
RED-2012 |
| 1992 |
Launched motor pump "Jetmate" (MP-25).
MP-25 |
| 1993 |
Launched JC series of high-pressure washer(JC-1).
JC-1 |
| 1996 |
Launched submersible pump for sewage water "Ponster" (PSK-32). |
| 1997 |
Launched battery-powered sprayer (MS-10).
MS-10 |
| 1999 |
Launched submersible pump for sewage water "Ponster" (PX-50).
PX-50 |
| 2001 |
Launched manual sprayer "Mister Auto" (HS-701).
HS-701 |
| 2008 |
Launched dry cell battery powered sprayer (JS-10). ※Industry's first
JS-10 |
| 2010 |
Launched engine pumps SEV series with KOSHIN engine (developed in-house).
SEV-50X |
| 2013 |
Launched engine-powered high-pressure washer JCE series with KOSHIN engine.
JCE-1408 |
| 2016 |
Launched inverter generators GV series with KOSHIN engine and battery powered snow remover (SR-350).
GV-16i 
SR-350 |
| 2017 |
Launched SBC/SLT series, Smart KOSHIN series of battery powered brush cutter.
Launched submersible pump PBX.
SBC-1825 
SLT-1820 
PBX-55022 |
| 2018 |
Launched hand-carry type brush cutter (EBC-26C) with KOSHIN engine.
Launched high-pressure engine pump SERH-50Z.
EBC-26C 
SERH-50Z |
| 2019 |
Launched battery-powered high-pressure washer, Smart KOSHIN series battery-powered garden tools.
SHT-1820 
SJC-3625
Launched trash pump KTZ with KOSHIN engine.
KTZ-100X
Launched diesel engine pumps SEY, STY and KTY series.
SEY-100D |
| 2023 |
Launched diesel engine pumps SEY with KOSHIN engine.
SEV-80D
|
| 2025 |
Launched diesel engine semi-trash pumps STV with KOSHIN engine.
 STV-80DS
Launched engine chainsaw ECS series.
 ECS-52
|
