More important piece of equipment than ever in these post truth times. Fully practical traditional pen and ink chart recorder polygraphs (can also be used as seismographs)
1645: Practical 3 pen polygraph/lie detector/seismograph/alternative fact tester film prop
1646: Contemporary lie detector/polygraph/seismograph/alternative fact tester
1971: Practical lie detector/polygraph/seismograph/chart recorder
2013: Large floorstanding 8 pen lie detector/alternative fact tester