emblem vs registered trademark

emblem

noun
  • A representative symbol, such as a trademark or logo. 

  • A picture accompanied with a motto, a set of verses, etc. intended as a moral lesson or meditation. 

  • Inlay; inlaid or mosaic work; something ornamental inserted in a surface. 

  • Something that represents a larger whole. 

registered trademark

noun
  • A trademark that has been officially registered with the government by its owner. Indicated by the symbol ®. 

How often have the words emblem and registered trademark occurred in a corpus of books? (source: Google Ngram Viewer )