last innovation in archtop design was the creation, in 1955, of "thinline" models with a reduced body depth. Notable thinline models include the successful Gibson ES-335, introduced in 1958, as well as the Epiphone Casino, introduced after Epiphone was acquired in 1957 by CMI, Gibson's parent company. These were more feedback resistant, comfortable to hold and easier to play standing up. The first thinlines were hollow bodies. Later thinlines such as the ES-335, ES-345 and ES-355 were semi-hollow. Thinlines can be classed as semiacoustic guitars, although not all semiacoustic guitars have an arched top. Thinlines became popular with mainstream pop and rock artists during the 1960s. The ES-335 and similar guitars were taken up by, and remain steadfastly popular with, electric blues players; B B King's various "Lucilles" are based on the ES-335. The 1970s and 1980s were a low point of interest in archtops, with many rock and pop (and some jazz and blues) players switching to solid body guitars. One manufacturer for this period was Robert Benedetto. Interest in archtops was revived in the 1990s. Archtops had long been expensive instruments, with a level of finish and ornament to match. Boutique luthiers such as Roger Borys and Bob Benedetto brought the aesthetics of the instrument to even greater heights, making them attractive to collectors, and also continuing to innovate in technical design. The Benedetto style of acoustic/electric archtop has itself been copied by luthiers such as Dale Unger and Dana Bourgeois. Most of the accessories (pickguard, bridge, tuner buttons, knobs, etc.) are made of wood (ebony or rosewood) instead of metal and have a clean acoustic look. It is estimated there are nearly 100 archtop guitar luthiers in North America alone. Contrastingly, mass-market archtop guitars became more affordable in the late 20th century, due to a combination of low labor costs in Asian countries and computer numerically controlled manufacture. Most major guitar marques include at least a couple of archtops in their range, albeit not necessarily manufactured at their own facilities. Ibanez sells an extensive range of archtops under the Artcore marque. The Samick corporation sells archtops under its own name besides manufacturing for other companies. Gibson sells inexpensive Asian-made archtops under its Epiphone brand, such as the Epiphone Dot. Renewed interest in acoustic music has also led to the revival of purely acoustic archtops, such as the Gibson L-7C, The Loar Lh-600, Godin 5th Avenue and the