Little Giant Adding Machine horns The Duaflex were designed as

The Duaflex were designed as a cheap

The Curly Nonpareil iHORN is made from a brass copper and/or brass horn which was mounted on a Model T

This is a cumulative inflation rate of 1312%

The Amplitone iHORN  is made from an early 1900s Crytal Radio headset amplifying horn

The Cema iHorn is a big bell radio horn made in Paris in 1924

Little Giant Adding Machine horns The Duaflex were designed asThe Little Giant Adding Machine iHORN is made from an antique Little Giant Adding Machine. It was patented in 1924 by John Pfeifer of Springfield, Ohio. Mr. Pfeifer was a free thinker with a creative mind to solve mechanical problems of the times. During his lifetime he took out over sixty patents, including calculating machines, cash registers, change makers, grave vaults, dictaphones, morgue tables, automatic curtain hangers, signal devices, locks