Which symbols represent only elements that are metals? 
Definitions:
Johannes Gutenberg
A German inventor and printer who introduced printing to Europe with his mechanical movable-type printing technology.
Image Consultants
Professionals who advise individuals and corporations on appearance, communication, and behavior to enhance personal or brand image.
Kennedy-Nixon
Refers to the first-ever televised U.S. Presidential debates in 1960 between John F. Kennedy and Richard Nixon, significantly influencing public opinion and the outcome of the election.
Cellphone
A portable electronic device used for mobile telecommunications, including voice calls, text messaging, and Internet access.
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