Final answer:
The removable parts of the Roundup contact toaster are etched with 'CONTACT' for ease of identification.
Step-by-step explanation:
The removable parts of the Roundup contact toaster have 'CONTACT' etched on them to make it easier to identify which toaster they belong to. This labeling helps ensure that parts are not mixed up between different models or units, which can be important for maintaining the warranty, ensuring the correct functioning of the toaster, and facilitating effective cleaning and maintenance procedures.