Martin lawsuit acoustic guitar logos

In 1970s Japan there was a healthy industry making copies of the popular Martin dreadnought acoustic models. These are often referred to as "lawsuit guitars" because Martin contacted these Japanese manufacturers in the 1970s (or early 1980s) asking them to stop copying their logo. I don't know whether there was ever an actual lawsuit. Many of these copies had logos that also copied the Martin style. Here are some of the ones I have found so far: