Analog and Digital Telegraph Keys of various brands yaesu, mfj, begali and kent.
The telegraph key is the tool by which the telegraph operator sent pulses from the transmission station following the Morse code.
Pressing the button for only a moment, you would get a point, pressing it for longer you would get a line, if it was not pressed, the back of the button touched a contact who established a connection with the receiving station which could send a Message.
Today the telegraph button is still used by amateur radios. In the modern form the manipulator, as it is called in jargon, consists of a stick that can be pushed sideways in both senses. If the stick is pushed in one direction, a circuit generates a point, if moved to the other generates a line. In this way the typing speed increases considerably and the duration of points and lines is determined with great precision.