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

Float-Type Regulator Valve and Constant Pressure Valve were completed.

95

Dashpot Type Non-Water Hammer Check Valve (Buffered Closing Main Valve) was completed.

96

In-house information network was completed. New production system started operation.

97

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.

01

Liquid-Air Switch Valve was completed.