These are many government companies, few of them are, Steel Authority of India Limited, Bharat Heavy Electricals Limited, Coal India Limited, State Trading Corporation of India, etc.
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Three government companies are:

1. Bharat Heavy Electricals Limited (BHEL)
2. Oil and Natural Gas Corporation (ONGC)
3. Air India Limited

Bharat Heavy Electricals Limited (BHEL)

Bharat Heavy Electricals Limited (BHEL) is a government-owned engineering and manufacturing company based in India. It was established in 1964 and is one of the largest engineering and manufacturing companies in India. BHEL is primarily engaged in the design, engineering, manufacturing, construction, testing, commissioning, and servicing of a wide range of products and services in the power sector, including thermal, hydro, nuclear, and gas-based power plants.

Key Points:
- Established in 1964
- Engaged in the design, engineering, manufacturing, construction, testing, commissioning, and servicing of power sector products and services
- Provides products for thermal, hydro, nuclear, and gas-based power plants

Oil and Natural Gas Corporation (ONGC)

Oil and Natural Gas Corporation (ONGC) is a multinational government-owned oil and gas company headquartered in Dehradun, India. It was founded in 1956 and is considered one of the largest oil and gas exploration and production companies in India. ONGC is involved in the exploration, development, and production of crude oil and natural gas both in India and abroad. The company also engages in refining, petrochemicals, and marketing activities.

Key Points:
- Founded in 1956
- Involved in the exploration, development, and production of crude oil and natural gas
- Engages in refining, petrochemicals, and marketing activities

Air India Limited

Air India Limited is the national flag carrier airline of India. It is owned by the government and operates both domestic and international flights. Air India was founded in 1932 and has since become one of the largest airlines in India. The company provides passenger and cargo transportation services to various destinations worldwide. It also offers various amenities and services to enhance the travel experience for its customers.

Key Points:
- Founded in 1932
- Provides passenger and cargo transportation services
- Offers various amenities and services for a better travel experience