Spud gun links to "Sputnik 1", so if anything it's just weird that "Sputnik-1 EMC/EMI lab model" doesn't appear to link to "Sputnik 1"

Well, rather, it DOES. Maybe the unencoded '/' in the URL (https://en.wikipedia.org/wiki/Sputnik-1_EMC/EMI_lab_model) breaks the 6 Degress of Wikipedia?