1. Bridge construction:
   Planning and construction of PC (pre-stressed concrete) bridges and structures, pre-beam bridges, superstructures, super-long-span suspension bridges, and stiffened girders.
2. Pre-casting:
   Planning, reproduction, and construction of pre-cast concrete products and pre-cast construction parts.
3. Public and preservation works:
   Maintenance, repair, and aesthetic improvements for bridges and steel structures.
4. Special Contractor's License:
   Ministry of Construction (S7-#3909).
5. General Contractor's License:
   Ministry of Construction (G7-#3909).
   Ministry of International Trade and Industry License (#393006).

1. Development and sale of construction industry-applied software:
   The development and sale of analysis software, automated bridge designing and drafting software, road planning software, as well as many other construction-related software.
2. Computer designing of bridges and other structures.
3. Development and sale of computer systems, hardware, and software.
4. Computer-related consultation.

Construction consulting registration #7-5600 (steel structure and concrete classes).

1. Repair of Bridges.
2. Inspection of bridges.
3. Painting of Bridges.
4. Sales and construction of expansion and contraction equipment for bridges:
   Items include and aluminium alloy-made CIPEC Joint and a rubber-made Breeze Joint.
5. Sale of bridge-surface drainage equipment:
   Spiral drains and other drainage systems.
6. Special Contractor's License:
   Ministry of Construction (S7-#13386)
   Construction consulting registration #7-5493 (steel structure and concrete classes).

1. Non-scheduled air transportation (license #19):
   Passenger transportation, chartered flights throughout Japan, sight-seeing flights, transportation of materials to construction sites, transportation of materials used in the construction of power lines, extension of power lines, forestry support, and other transportation of heavy goods.
2. Ministry of Transport Aircraft Operator Business License (license #30):
   Agricultural spraying, television news and newspaper broadcast support, aerial photography, movie filming support, advertising efforts, disaster relief and rescue efforts, fire fighting activities, pilot training, aerial surveying, and research of underground resources.
3. Sale and service of aircraft and parts.

1. Unscheduled airline transportation
   Passenger transportation, chartered flights throughout Japan, sight-seeing flights, transportation of materials to construction sites, transportation of materials used in the construction of power lines, extension of power lines, forestry support, and other transportation of heavy goods.
2. Ministry of Transport Aircraft Operator Business License
   Agricultural spraying, television news and newspaper broadcast support, aerial photography, movie filming support, advertising efforts, disaster relief and rescue efforts, fire fighting activities, pilot training, aerial surveying, and research of underground resources.

1. Sale of steel materials.
2. Sale of cast steel products, various bolts, and other steel materials.
3. Sale of various construction-related machinery and tools.