Linear is a company that specializes in manufacturing intercom systems, specifically telephone callbox intercoms. These are intercoms that are typically installed in public areas, such as outside of a residential building or in a parking garage, and allow individuals to make a phone call from a designated phone booth.

Linear was founded in the early 1960s, with a focus on providing high-quality intercom systems for both residential and commercial use. The company quickly gained a reputation for producing reliable and durable intercoms, and over the years has continued to innovate and expand its product line. Today, Linear offers a wide range of intercom systems for a variety of applications, including telephone callboxes, video intercoms, and audio intercoms.

One of Linear's most popular products is its line of telephone callbox intercoms. These intercoms are designed to be simple and easy to use, with a straightforward interface that allows users to make a call by pressing a button and speaking into a microphone. The callbox intercoms are also built to be durable and able to withstand harsh weather conditions, making them ideal for outdoor use.

In addition to telephone callbox intercoms, Linear also offers video intercoms, which allow users to see and communicate with visitors at their front door or gate. These intercoms are often used in residential buildings and gated communities, and can be integrated with security systems for added convenience and security.

Linear's intercom systems are known for their high-quality construction and reliable performance. The company uses only the best materials and components in its products, and each intercom is rigorously tested to ensure that it meets the company's strict quality standards. As a result, Linear's intercom systems are widely considered to be some of the best in the industry.

Overall, Linear is a well-respected and established manufacturer of intercom systems, with a strong focus on producing high-quality, reliable products. The company's telephone callbox intercoms are particularly popular, and are used in a variety of settings, from residential buildings to parking garages and beyond.