1870s 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s
1887
1889
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1888

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American Magnetic Electric intercom
American Magnetic Electric intercom
First blue 'Bell' signs start to appear in the U.S.
First blue 'Bell' signs start to appear in the U.S.
Supreme Court upholds Bell's patent
Supreme Court upholds Bell's patent