71.   Using these signals, scientists can create computer pictures of distant galaxies and interstellar gas clouds that are invisible to optical telescopes.

72.   But as the antennas use weaker signals, PHS users must either stand in one place or walk slowly.

73.   Using hand signals, Jones sent his observations down to the afterguard.

74.   Swai even said referees worked in pairs, by using hand signals, to ensure the white fighter won.

75.   The Bundesbank has made clear that it wants the future European central bank to use similar signals in managing its monetary policy.