Question: When did the manufacturer of a pedometer accessory for the iPod become a publicly traded company?

full_context: Document 1: IPod: Unlike many other MP3 players, simply copying audio or video files to the drive with a typical file management application will not allow an iPod to properly access them. The user must use software that has been specifically designed to transfer media files to iPods, so that the files are playable and viewable. Usually iTunes is used to transfer media to an iPod, though several alternative third-party applications are available on a number of different platforms.
Document 2: Goodby, Silverstein & Partners: The agency was founded in 1983 as Goodby, Berlin & Silverstein by Jeff Goodby, Andy Berlin and Rich Silverstein. Andy Berlin left in 1992 and the agency was renamed. Goodby, Silverstein & Partners is now part of the Omnicom Group, Inc., an advertising holding company. The agency is based in San Francisco, CA. In 2015, after 32 years, Rich Silverstein and Jeff Goodby announced they were passing on the reigns of the creative department to Margaret Johnson, Executive Creative Director and Eric Kallman, Executive Creative Director. Margaret and Eric were also named to Adweek's Creative 100 list in 2015. Derek Robson has been the President and Managing Partner since 2005.
Document 3: Air Jordan: The silhouette of Michael Jordan served as inspiration to create the ``Jumpman ''logo. Product type Footwear, clothing Country United States Introduced November 17, 1984; 33 years ago (1984 - 11 - 17) Markets Worldwide Website Air Jordan at Nike
Document 4: Nike, Inc.: In 1976, the company hired John Brown and Partners, based in Seattle, as its first advertising agency. The following year, the agency created the first ``brand ad ''for Nike, called`` There is no finish line'', in which no Nike product was shown. By 1980, Nike had attained a 50% market share in the U.S. athletic shoe market, and the company went public in December of that year.
Document 5: Adidas: In 2005, Adidas introduced the Adidas 1, the first ever production shoe to use a microprocessor. Dubbed by the company "The World's First Intelligent Shoe", it features a microprocessor capable of performing 5 million calculations per second that automatically adjusts the shoe's level of cushioning to suit its environment. The shoe requires a small, user-replaceable battery that lasts for approximately 100 hours of running. On 25 November 2005, Adidas released a new version of the Adidas 1 with an increased range of cushioning, allowing the shoe to become softer or firmer, and a new motor with 153 percent more torque.On 11 April 2006, Adidas announced an 11-year deal to become the official NBA clothing provider. The company has been making NBA, NBDL, and WNBA jerseys and products as well as team-coloured versions of the "Superstar" basketball shoe. This deal (worth over $400 million) took over the previous Reebok deal that had been put in place in 2001 for 10 years.
Document 6: IPod: The dock connector also allowed the iPod to connect to accessories, which often supplement the iPod's music, video, and photo playback. Apple sells a few accessories, such as the now-discontinued iPod Hi-Fi, but most are manufactured by third parties such as Belkin and Griffin. Some peripherals use their own interface, while others use the iPod's own screen. Because the dock connector is a proprietary interface, the implementation of the interface requires paying royalties to Apple.
Document 7: IPod: Many accessories have been made for the iPod line. A large number are made by third party companies, although many, such as the iPod Hi-Fi, are made by Apple. Some accessories add extra features that other music players have, such as sound recorders, FM radio tuners, wired remote controls, and audio/visual cables for TV connections. Other accessories offer unique features like the Nike+iPod pedometer and the iPod Camera Connector. Other notable accessories include external speakers, wireless remote controls, protective case, screen films, and wireless earphones. Among the first accessory manufacturers were Griffin Technology, Belkin, JBL, Bose, Monster Cable, and SendStation.
Document 8: IPod: iPods have won several awards ranging from engineering excellence,[not in citation given] to most innovative audio product, to fourth best computer product of 2006. iPods often receive favorable reviews; scoring on looks, clean design, and ease of use. PC World says that iPod line has "altered the landscape for portable audio players". Several industries are modifying their products to work better with both the iPod line and the AAC audio format. Examples include CD copy-protection schemes, and mobile phones, such as phones from Sony Ericsson and Nokia, which play AAC files rather than WMA.
Document 9: Air Jordan: Air Jordan is a brand of basketball footwear and athletic clothing produced by Nike. It was created for former professional basketball player, Michael Jordan. The original Air Jordan I sneaker, produced for Jordan in 1984, were released to the public in 1985. The shoes were designed for Nike by Peter Moore, Tinker Hatfield, and Bruce Kilgore.
Document 10: IPod: The third generation began including a 30-pin dock connector, allowing for FireWire or USB connectivity. This provided better compatibility with non-Apple machines, as most of them did not have FireWire ports at the time. Eventually Apple began shipping iPods with USB cables instead of FireWire, although the latter was available separately. As of the first-generation iPod Nano and the fifth-generation iPod Classic, Apple discontinued using FireWire for data transfer (while still allowing for use of FireWire to charge the device) in an attempt to reduce cost and form factor. As of the second-generation iPod Touch and the fourth-generation iPod Nano, FireWire charging ability has been removed. The second-, third-, and fourth-generation iPod Shuffle uses a single 3.5 mm minijack phone connector which acts as both a headphone jack and a data port for the dock.
Document 11: Nicotine marketing: In April 1970, President Nixon signed into law the Public Health Cigarette Smoking Act banning the advertising of cigarettes on television and radio starting on 2 January 1971. The Virginia Slims brand was the last commercial shown, with ``a 60 - second revue from flapper to Female Lib '', shown at 11: 59 p.m. on 1 January during a break on The Tonight Show. Smokeless tobacco ads, on the other hand, remained on the air until a ban took effect on 28 August 1986. Even further restrictions took effect under the Family Smoking Prevention and Tobacco Control Act. Effective 22 June 2010, the new regulations prohibit tobacco companies from sponsoring sports, music, and other cultural events. Also, tobacco companies can no longer display their logos or advertise their products on T - shirts, hats, or other apparel. Eventually, the law is planned to require almost all tobacco advertisements to consist of black text on a white background, but the constitutionality of that requirement has come under scrutiny.
Document 12: IPod: During installation, an iPod is associated with one host computer. Each time an iPod connects to its host computer, iTunes can synchronize entire music libraries or music playlists either automatically or manually. Song ratings can be set on an iPod and synchronized later to the iTunes library, and vice versa. A user can access, play, and add music on a second computer if an iPod is set to manual and not automatic sync, but anything added or edited will be reversed upon connecting and syncing with the main computer and its library. If a user wishes to automatically sync music with another computer, an iPod's library will be entirely wiped and replaced with the other computer's library.
Document 13: Sells Ltd: Sells Ltd, an advertising agency, was opened in 1869 in London. By 1900, it was the largest agency in the world with offices in London, Paris, Edinburgh and Montreal. In the 1950s it made advertising history when it appointed the first woman to be a managing director in the business. Olive Hirst had joined Sells in 1931 as a typist and then worked across a number of departments. In January 1950, she was the first women to be appointed to the Board and in 1954 she took over the managing directors role.
Document 14: IPod: Before the release of iOS 5, the iPod branding was used for the media player included with the iPhone and iPad, a combination of the Music and Videos apps on the iPod Touch. As of iOS 5, separate apps named "Music" and "Videos" are standardized across all iOS-powered products. While the iPhone and iPad have essentially the same media player capabilities as the iPod line, they are generally treated as separate products. During the middle of 2010, iPhone sales overtook those of the iPod.
Document 15: Michael Jordan: Jordan is also known for his product endorsements. He fueled the success of Nike's Air Jordan sneakers, which were introduced in 1985 and remain popular today. Jordan also starred in the 1996 film Space Jam as himself. In 2006, he became part - owner and head of basketball operations for the then - Charlotte Bobcats, buying a controlling interest in 2010. In 2015, Jordan became the first billionaire NBA player in history as a result of the increase in value of NBA franchises. He is the third - richest African - American, behind Oprah Winfrey and Robert F. Smith.
ground_truth: 1980
sub_queries: Who manufactures a pedometer accessory for the iPod? Answer: Nike
when did Nike become a publicly traded company Answer: 1980