| 1930 |
In 1955, a technological innovation occurred in the waterproofing materials industry. It was the domestication of oil-based caulking materials, which were the mainstream for exterior wall joints. Founder Masaru Kariya, who was working as a sales agent for Showa Chemical Co., Ltd., became independent to launch a new product, starting as a freelance engineer. In 1956, he was responsible for waterproofing work at the Okayama Prefectural Office, and later established Masaru Industries Co., Ltd. on September 30, 1957. |
| 1931 |
At the end of 1956, waterproofing work was carried out at the Okayama Prefectural Office, and for the following ten months, the application methods of oil-based caulking materials were experimented with and studied. The craftsmen were guided, and the techniques were spread. |
| 1932-09-28 |
On September 30, 1957, Masaru Industries Co., Ltd. was established. Initially, it had two employees, started in a rented space at Showa Chemical Co., Ltd.'s building, and grew into a group of seven young warriors within a year and a half. |
| 1933 |
An employee, Haruna, who was responsible for caulking work at Showa Chemical Co., Ltd.'s factory, directly approached and gained trust by selling the silicone water-repellent material 'EverTite' to be tested on exposed concrete. |
| 1955 |
In 1955, a technological innovation occurred in the waterproofing materials industry. It was the domestication of oil-based caulking materials, which were the mainstream for exterior wall joints. |
| 1955 |
By the latter half of 1955, the company was reputed to possess the highest level of technology within the industry. |
| 1955 |
The plan was initiated in the latter half of 1955 and completed in 1962. |
| 1956 |
At the end of 1956, the waterproofing work at the Okayama Prefectural Office was carried out. |
| 1957-09-28 |
Established on September 30, 1957. |
| 1957-09-28 |
On September 30, 1957, Masaru Industries Co., Ltd. was established. |
| 1957-09-28 |
Established: September 30, 1957 |
| 1960 |
The Mitsui Kasumigaseki Building, completed in 1970, was a high-rise building constructed by a joint venture of Kajima Corporation and Mitsui Construction Co., Ltd., featuring innovative construction methods and materials, which greatly influenced subsequent super-high-rise building constructions. |
| 1968 |
The building was completed in 1962, constructed with cutting-edge technology for high-rise buildings by a joint venture of Kajima Corporation and Mitsui Construction Co., Ltd. |
| 1970 |
In the 1970s, Masaru's technological capabilities began to spread not only within Japan but also overseas. |
| 1980 |
Since the 1970s, various construction methods and patented technologies have been developed, and renewal projects that help assess and diagnose building safety and deterioration have been carried out. |
| 1983 |
The work at the National Diet Building was carried out in 1983. |
| 1986 |
In 1983, work was carried out on the National Diet Building, restoring and renewing this historic structure. |
| 1989 |
Renewal work was carried out on Mitsui Kasumigaseki Building in Heisei 1 (1989) |
| 1990 |
From the 1980s, practical construction methods for building deterioration surveys and diagnoses have been developed, contributing to the renewal of many historic and modern buildings. |
