life raft vs pedalo

life raft

noun
  • A usually inflatable raft carried aboard a ship or airplane, used to save lives in case the vessel has to be abandoned in an emergency on the sea. 

pedalo

noun
  • A small boat propelled by pedals that directly turn external paddles, used for recreation. 

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