Final answer:
The space bar, tabulator, backspace, and stencil switch are all parts of the keyboard, which is a key component in devices used for typing and text input.
Step-by-step explanation:
The location of keys such as the space bar, tabulator, backspace, and stencil switch is related to the keyboard. Specifically, these keys are integral parts of the keyboard layout that allow a user to interact with a device, whether it is a computer, typewriter, or another technology with text input capabilities.
The space bar is used to insert spaces between words, the tabulator (or tab key) is often used for indentation or moving to the next field in forms, the backspace key is used to delete text to the left of the cursor, and the stencil switch is a term not commonly used in modern computer keyboards but may refer to a special function key on other types of machinery or in specific contexts.