Sybian wired remote control. Flexible moulded attachments are supplied which fit over the vibrating ridge and shaft which mostly have integrated dildos on their top. In use, the rider locates the dildo into their body cavity for internal stimulation while pressing their external erogenous parts on the vibrating ridge. According to its inventor Dave Lampert, the Sybian was first conceived in the 1970s, and developed in 1983. A prototype was built in 1985 from sheet metal mounted on a wooden frame with a vibrator projecting through an opening inside the housing; a second prototype became the basis for current production models.
Is-a the relations "has-a" and "is-a" is a common error when designing a model (e.g., a computer program) of the real-world relationship between an object and its subordinate. The "is-a" relationship may also be contrasted with the "instance-of" relationship between objects (instances) and types (classes): see "type-token distinction" and "type-token relations." To summarize the relations, we have Subtyping enables a given type to be substituted for another type or abstraction. Subtyping is said to establish an is-a relationship between the subtype and some existing abstraction, either implicitly or explicitly, depending on language support. The relationship can be expressed explicitly via inheritance