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Telecommunications-related introductions in the 1970s
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206:Telecommunications-related introductions by year
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163:112 (emergency telephone number)
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200:Categories
175:G.711
134:2020s
129:2010s
124:2000s
119:1990s
114:1980s
108:1970s
102:1960s
97:1950s
92:1940s
87:1930s
82:1920s
71:1978
66:1977
61:1976
56:1974
51:1973
46:1972
41:1970
36:1968
31:1967
26:1965
21:1963
158:0–9
202::
152:.
182:S
170:G
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