pickups, Harry DeArmond developed a fretboard-tapping technique for guitar performance, creating notes with hammer-on and pull-off rather than picking, and sometimes playing two guitars simultaneously. DeArmond's method was adopted by Jimmie Webster, a designer and demonstrator for Gretsch Guitars. Webster wrote a brief instruction book in 1952, popularized the technique in his travels, and in 1959 recorded an LP, Webster's Unabridged: Jimmie Webster's Stereo Guitar (RCA Victor LPM-1942). The "gold foil" and 2000 models In the 1950s, with the increasing popular interest in "electrified" guitars, some manufacturers turned to Rowe Industries rather than expending resources on making their own pickups. As a result, Harry DeArmond is best known for pickups used on inexpensive "beginner" instruments as well as quality guitars. Most widely distributed were the so-called "gold foil" pickups, primarily installed in inexpensive Harmony Company guitars. Generally, these have a chrome-plated metal casing, with cut-out shapes (leading to further colloquial naming: diamond, S, moustache, scroll, and more), beneath which was placed a metalized plastic shim, for aesthetic reasons as well as to simply keep dust away from the pickup's inner parts. Being very simple in design, most of these pickups had no height adjustment, and often needed to be installed on some sort of a riser or pedestal to achieve optimum distance from the strings. Though widely scorned for years, these "cool"-impedance pickups eventually achieved popularity, in part because of the unique tone imparted by the heavy steel mounting plates. (The "gold foil" pickups were sometimes called "Golden Tone" pickups in catalogue copy; these should not be confused with the later "Goldtone" two-coil humbucking pickups.) Among the finest — and most complex — DeArmond pickups were the Model 2000. These are best known for appearing on better models of Gretsch guitars, where they were called the Dynasonic (or sometimes DynaSonic, later renamed the FidelaTone so as not to clash with Rogers Drums over their Dyna-Sonic snare). These feature a moderately complex system of individual polepiece height adjustment, with the result that the steel components account for part of the pickup's unique tonal characteristics. Harmony and Gretsch were the most important DeArmond customers. Besides them Rowe Industries pickups (including pressure-rod models) were factory installed by a wide range of other brands: C.F. Martin & Company used DeArmonds on their electrified D-18E and D-28E models. Other brands include Airline, D'Angelico, Eko, Epiphone, Fender, Galanti, Guild, Hofner, Kustom, Levin, Meazzi, Messenger, Micro-Frets, Premier,