| Year | Company history and activity |
1948 | Yokota Pump Laboratory was established in Kure. |
52 | Self-Priming Centrifugal Pump was completed. |
53 | Yokota Pump Manufacturing Co., Ltd. was established in Deshiocho, Hiroshima. |
56 | Head office and plant were relocated to Yoshijimacho, Hiroshima and expanded. 0.25ton arc electric furnace was installed. |
57 | Received the National Coal Mine Technical Award. (Hidekuni Yokota and Shingo Yokota) |
59 | Company name was changed to Yokota Manufacturing Co., Ltd.. Plant was relocated to Minami Yoshijima, Hiroshima and expanded. Multistage Self-Priming Pump was completed. Self-priming high pressure mine shaft drain pump was delivered to Mitsubishi Takashima Mine. |
1960 | Non-Water Hammer Check Valve was completed. |
61 | 350HP Multistage Self-Priming Pump was delivered to Tanahara Mine. |
62 | Wear resistant high Cr cast iron CCR was completed. |
63 | Enhanced Self-Priming Pump was completed. |
64 | Head office was relocated and integrated with plant. Automatic Water Pumping System was completed. |
65 | Received the Chugoku Science Award. (Hidekuni Yokota and Shingo Yokota) |
66 | Enhanced Self-Priming Pump with large bore was delivered to Mitsubishi Takashima Mine. |
67 | Additional plant for assembly and test drive was built. |
68 | Received the Purple Ribbon Medal from government. (Hidekuni Yokota) |
69 | Direct Flow Water Supply System was completed. |
1970 | 0.5ton high frequency electric furnace was installed. |
71 | Constant Flow Regulator Valve was completed. |
72 | Head office building was renewed. Additional test driving plant for large pumps, and storage structure were built. 1,000mm-bore Non-Water Hammer Check Valve was delivered to Kitakyushu City. |
73 | Corrosion and wear resistant Special Stainless Steel YST was completed. |
74 | Large Mixed-Flow Volute Pump for fuel gas desulfurizer was delivered to Chugoku Electric Power Co., Inc. in Mizushima. |
75 | 1.5ton high frequency electric furnace was installed. |
76 | Large Mixed-Flow Volute Pump for coal fuel gas desulfurizer was delivered to Electric Power Development Co., Ltd. Isogo Thermal Power Station. |
77 | Defoaming Pump was completed. Main processing pump for petroleum protein was delivered to Romania. |
79 | Received the Electricity Rationalized Plant Award. |
1980 | Test driving plant for large pumps was renewed and expanded. |
81 | Large Mixed-Flow Volute Pump for coal fuel gas desulfurizer was delivered to Electric Power Development Co., Ltd. 700,000kW Takehara Thermal Power Station. |
82 | Material research laboratory and additional storage structure were built. |
83 | Fluorescence X-ray spectroscopy system was installed. |
87 | Loop driving system for large pumps and valves was installed. 450mm-bore Constant Flow Regulator Valve was delivered to Kanto Regional Agricultural Administration Office. |
88 | Large Mixed-Flow Volute Pump for coal fuel gas desulfurizer was delivered to Electric Power Development Co., Ltd. 1 million kW Matsuura Thermal Power Station. |
1990 | Seawater Resistant Stainless Steel YST130N was completed. |
92 | Clean Pump was completed. 600mm-bore Constant Flow Regulator Valve was delivered to Kanto Regional Agricultural Administration Office. |
93 | 1,350mm-bore Non-Water Hammer Check Valve was delivered to Amagasaki City. |
94 | Hiroshima branch office was established. Float-Type Regulator Valve and Constant Pressure Valve were completed. |
95 | Merger of Yokota Giken Corporation. Dashpot Type Non-Water Hammer Check Valve (Buffered Closing Main Valve) was completed. |
96 | In-house information network was completed. Mac production system started operation. |
97 | Kyushu office was merged into head office. Dashpot Type Non-Water Hammer Check Valve (Buffered Closing By-pass Valve) was completed. Pilot-Type Regulator Valves were completed. |
98 | Non-External-Flushing Mechanical Seal was completed. |
2000 | Degassing Pump and Automatic-Cleaning Strainer were completed. |
2001 | Liquid-Air Switch Valve was completed. |
