Plastic Shell Equips Phone For Two-Way Listening (Nov, 1953)
Filed under: Just Weird, Telephone — @ 10:03 am
Source: Popular Mechanics ( More articles from this issue )
Issue: Nov, 1953
Buy on Ebay
Source: Popular Mechanics ( More articles from this issue )
Issue: Nov, 1953
Buy on Ebay
Plastic Shell Equips Phone For Two-Way Listening
Two persons can share the same telephone with a device patented by Roger Heap of Lyme, Conn. Simple in design, it consists of a T-shape plastic shell which cups over the receiving end of the phone. The hollow arms transmit the message to listeners at both sides. Heap fashioned the device so that he and Mrs. Heap could join in three-way conversations with their son in Detroit.
