berlin vs cabriolet

berlin

noun
  • A four-wheeled carriage with a separate sheltered seat behind the body. 

  • Coordinate terms: calèche, landau 

cabriolet

noun
  • A light two- or four-wheeled carriage with a folding top, pulled by a single horse. 

  • An automobile with a retractable top. 

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