multiplug vs power strip

multiplug

noun
  • An electric device that allows more than one plug to connect to a single socket by containing multiple similar sockets; particularly for mains electricity. 

power strip

noun
  • A block of electrical sockets that attaches to the end of a flexible cable and allows multiple electrical devices to be plugged in. 

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