Actually, there's a little more to them than that, trackrat.
According to Jim Webb, the Shure 55 "Elvis" mic is one of the "12 Microphones That Changed History".
Shure Unidyne Model 55
"The Shure Unidyne's history dates back to 1937, when Ben Bauer began searching for a way to make a much simpler and more reliable directional mic using a single element.
Bauer found that by utilizing time delay networks on sounds arriving at openings at the back of the mic ("uniphase," as Shure called the system), he was able to achieve controlled cancellation and produce a cardioid pattern.
In 1939, Shure introduced the Model 55A (30-50 ohms), Model 55B (200-250 ohms) and the high-impedance Model 55C. In the ’40s, Shure added the shock-mounted broadcast models 555 and 556. The small Unidyne was introduced in 1951, which eventually became today's Shure SM57.
It's hard to imagine another microphone based on its original concept and styling that has remained in production as long as some version of the Unidyne.
I believe its styling is one of the three most recognizable microphone shapes ever created, the other two being
the RCA 44 and 77."
---Jim Webb