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Title card: "Electric 'Eye' Nabs Speeders" / man kneels at control panel of device and shows highway patrolman how it operates as cars go past; patrolman stands up / diagram shows how device works as someone with pointer indicates different parts of diagram / patrolman kneels at control panel of device and operates it / CU dial indicating miles per hour of passing cars / man standing beside device points at words "MSC Highway Speed Meter" painted below control panel / closer view of control panel / patrolman pulls away on motorcycle from man standing at device and goes after speeder / patrolman chases speeding car / patrolman shows speeding driver on device what speed he was going, patrolman writes ticket and hands it to driver / Note: exact month/day not known