Joseph Zimmerman

engineer who invented the first telephone answering machine, the Electronic Secretary. He sold the contraption to General Telephone and Electronics Inc. in 1957.

Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved.

• 
  • Calculator
  • Spelling Checker
  • Place Finder
  • Distance Calculator
  • Periodic Table
  • Conversion Tool
  • Perpetual Calendar
  • Year by Year
  • Fact Monster

24 X 7

Private Tutor

	24 x 7 Tutor Availability
	Unlimited Online Tutoring
	1-on-1 Tutoring

Explore Online Tutors , Precalculus Review