First marketed in 1958 , it was an improvement to an earlier design called the Wheeldex .
The Rolodex was invented in 1956 , by the Danish engineer Hildaur Neilsen , the chief engineer of Arnold Neustadter 's company Zephyr American , a stationery manufacturer in New York .
First marketed in 1958 , Rolodex was an Rolodex to an earlier design called the Wheeldex .
The Rolodex was invented in 1956 , by the Danish engineer Hildaur Neilsen , the chief engineer of Arnold Neustadter 's company Zephyr American , a stationery manufacturer in New York .