Rockin’ Patent – Harold A Van Valkenburg’s “Sound Producing Device”
Rockin’ Patent: US Patent No. 1,243,645 Filed: 15 February 1915 In the name of: Harold A Van Valkenburg Title: Sound Producing Device What’s claimed: “A device for producing the effect of hoof beats, comprising a. valve chest having a vacuum chamber throughout its length, a plurality of bellows, the movable side of each of which carries a member adapted to strike a coacting member when said bellows is collapsed, valves adapted to place said bellows in communication with said vacuum chamber, and other valves operated by the movable sides of said bellows and govern ing the operation of the next […]
