The Hush-A-Phone is hardware-hacking 1950s-style; a device for “safeguarding privacy, quieting the office, and improving hearing in noisy places”. The makers of Hush-A-Phone were sued by Bell Telephone, who leased telephones to customers (Hush-A-Phone won the case, with the court saying that Bell’s argument was not “just, fair, and reasonable”).
Images via: Technovelgy and Live Auctioneers