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GB867804A
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Improvements in apparatus for monitoring the use of radio receivers
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GB850075A
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Improvements in or relating to apparatus for determining the listening or viewing habits of wave signal receiver users
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GB850588A
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Lamp control circuit
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GB847597A
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Improvements in apparatus for monitoring the use of radio receivers
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GB838346A
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Apparatus for indicating at a remote point the tuning condition of a plurality of wave signal receivers
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GB827075A
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Improved apparatus for monitoring the tuning condition of television receivers
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GB826736A
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Improvements in or relating to television receiving apparatus
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GB819524A
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Improvements in or relating to apparatus for indicating or recording the listening or viewing habits of the users of radio receivers
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GB823363A
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Improved data recording apparatus
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GB824772A
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Improvements in or relating to recording apparatus more particularly for use in conjunction with radio receivers
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GB794342A
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Apparatus for determining the transmitting station to which a radio receiver is tuned
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