A helicopter is a type of aircraft that uses rotating wings to fly. It can take off or land vertically, hover, and fly backward, forward, and laterally. These attributes allow its application in isolated or congested areas where vertical takeoff and landing (VTOL) cannot be performed by fixed-wing aircraft.

A fuel cell is a device that converts chemical energy to electrical energy in the presence of an electrolyte. It has two electrodes - an anode and a cathode, which facilitate the movement of positively and negatively charged ions to produce water and heat as by-products. Therefore, defense agencies are inclined toward fuel cell technology for their military aircraft (manned and unmanned).

A construction dumper is defined as the medium used to transport loose materials such as sand, gravel, and aggregates for construction purposes. A construction dumper is equipped with an open bed box at the rear end of the dump truck. It also has a hydraulic piston, which lifts the hauler or trailer to dump the required material on the ground.

A commercial aircraft battery management system is a critical component in aviation that is responsible for managing and monitoring the health and performance of the batteries used in aircraft. These batteries serve various essential functions in commercial aircraft, such as providing backup power, emergency power for critical systems, and powering auxiliary equipment on the ground.

Tires are an integral part of an aircraft and are produced using various components such as synthetic rubber or natural rubber, with addition to carbon black and nylon tire cord fabric. The durability of aircraft tires depends on the aircraft models (endurance varies between 30-200 landings). However, by introduction of new-generation radial tires, the events of tire wear out are expected to decline.

Trolleys are used in industrial, airports, hospitality, and other applications to move goods from one place to another. Vendors manufacture different types of trolleys depending on the needs of the target industry.

The train collision avoidance system (TCAS) offers a warning or situational awareness that is specifically designed to prevent train collisions. Such systems are also extensively used in the mining and automotive sectors, apart from the railways sector, to avoid accidents caused by collisions. These are not specific to train mounting and can be deployed on railway tracks, crossings, and track-changing junctions.