Industrial designer Henry Dreyfuss worked with Bell Telephone Laboratory's engineers beginning in 1930 and stressed the need for unifying equipment design and modifying the aesthetic of the telephone. As a result, the model no. 302 was a marked improvement over its predecessor, the 1927 model no. 202, in both form and function. The newer design incorporated the same finger wheel but balanced the weighty transmitter/receiver handset with a sturdy rectangular base. Dreyfuss pays homage to a 1930 Bakelite plastic phone designed by Jean Heiberg for the L. M. Ericsson Company of Stockholm in the upper body's inward curve, a detail that was dropped from later designs. Along with Bell telephones, other works, including Hoover vacuums, John Deere tractors, and the Big Ben clock, have become recognizable Dreyfuss designs.