Products without trademarks can be sold, except for goods that are required by the state to use registered trademarks.

Registered trademarks can be used in production, sales and other business activities, but the user does not have exclusive rights to the trademark and cannot prohibit others from using it.

A telescope is an optical instrument that uses lenses or mirrors and other optical devices to observe distant objects. It uses the refraction of light through a lens or the reflection of light by a concave mirror to enter a small hole and converge into an image, and then is seen through a magnifying eyepiece, also known as a telescope.