| MARCH, 1946 | Privately founded under the name of Yokoi Kikai Kosakusho in Wakaba-tori, Kita-ku, Nagoya |
| JUNE, 1950 | Developed a low-pressure air atomizing oil burner, and started manufacturing and marketing the burner under the 「  」 brand |
| MAY, 1953 | Founded Yokoi Kikai Kosakusho Co., Ltd. with a capital of 1,000,000 yen |
| APRIL, 1961 | Increased the capital to 1,500,000 yen |
| DECEMBER, 1963 | Increased the capital to 3,000,000 yen |
| NOVEMBER, 1964 | Increased the capital to 6,000,000 yen |
| FEBRUARY, 1966 | Relocated our Head Office and factory to 2720-1, Ohorakuchi, Nakashidami, Moriyama-ku, Nagoya |
| MARCH, 1967 | Increased the capital to 8,600,000 yen |
| MAY, 1968 | Started to manufacture various types of gas burners |
| DECEMBER ,1970 | Fully equipped with a 1.8m3 multipurpose test furnace and incidental equipment |
| FEBRUARY, 1973 | Fully equipped with a 330m2 warehouse of steel frame with slate roofing and product inspection equipment |
| FEBRUARY, 1974 | Increased the capital to 13,000,000 yen |
| JUNE, 1974 | Increased the capital to 18,200,000 yen |
| OCTOBER, 1975 | Fully equipped with a 231m² building of steel frame with slate roofing, a 6m3 experimental furnace for developing green burners, NOx measuring equipment, noise recorders and other incidental equipment |
| DECEMBER, 1975 | Increased the capital to 21,000,000 yen Introduced the employee stock ownership plan |
| DECEMBER, 1984 | Increased the capital to 23,500,000 yen |
| DECEMBER, 1985 | Increased the capital to 26,000,000 yen |
| MARCH, 1991 | Added with a 380m² factory of steel frame with slate roofing |
| MARCH, 1996 | Celebrated our 50th year in business |
| MARCH, 2016 | Celebrated our 70th year in business |
| MARCH, 2021 | Celebrated our 75th year in business Remains in operation as of today. |