Notes: "Cheap? Cheap and cheerful is more like it. While these adders were all quite cheap when new (one word: plastics), they all work, although some have gotten a bit stiff with age. None of these are built with the quality of an Addiator brand slide adder, and as such these represent the “novelty” end of the slide adder market. The six adders comprise two versions of the Baby Calculator, a Magic Brain, a Tom Thumb, a Compact Calculator, and one simply marked "Calculator"
