The number of episodes of each prop given to Detective Conan by Dr. Agasa is as follows: 1. Smaller Poison [APTX4869]: episodes 1 - 9 2 Conan's Body Shrinking Device [Akai Shuichi's Antidote]: episodes 10 - 12 Bow Tie Voice Changer: episode 13 4. Conan's Mystery Item "Files73-Files74": episodes 26 - 27 5 Conan's Tracking Tool "Tracking Glasses": episode 28 6. Shirai Shuichi's Killing Weapon: The Dead Body of Keimi Kata (episode 34) 7 Conan's Disguise Item "Mask of the Christmas Hall": episode 39 8 Kudo Shinichi's Revival Item,"Orchid Flute": episodes 40 - 42 9 Conan's Puzzle-solving Item [File 23 - File 26]: episodes 67 - 68 10 Conan and Dr. Agasa's "The Weirdos of the Magic Train": episodes 70 - 71