Nomenclature: How to describe this switch
They used to be called radio buttons but a search for those will return all software version for GUI applications. 



Figure 1. Interlocking push-button switches. Pressing one button cams the holding bar sideways to release the other buttons.

You will find better results searching for "interlocking push-button switches".

Note: The English word "depress" (in the context of buttons or levers) means the same as "press" so you may cause search confusion. Use "un-press" or "release" instead.