Edison Lock This is a toy that was played with around the 1980s. Only the parts shown in the image are included. It was a favorite toy, so it has quite a bit of damage, but it can still be played with. The action of turning the screws is good for finger dexterity. Moving your fingertips is said to increase blood flow to the brain, which may be effective in developing children's intelligence and preventing dementia. It seems that even just thinking about how to expand on it, such as making holes in cardboard and fastening them with screws, or finding other uses for it, can stimulate the brain. #EdisonLock #EducationalToy Showa Retro Bolt Nut Assembly Toy