The Yamaha logo has been through four different styles and so has been revised three times. The changes have been because the name of the company slighlty changed or to make the logo cleaner and clearer.
Yamaha
Yamaha.
yamaha
Yamaha
Tuning Forks
if they are tuning keys it is Yamaha
I believe that would be Yamaha, because I know that Yamaha music products have that logo.
yamaha
The Subway Logo has only been changed once thus far apparently. From 1965 to 2002 they had a constant logo, and from 2002 till present they've had a newer one.
A type-based logo has only text in it. Xerox or Yamaha is an example. A mark based logo has a symbol associated with it. Nike and McDonalds are examples.
nintendo
There have been several variations of the British Airways Logo. The current British Airways logo has been in use since 1997. This is a registered logo with restrictions on usage.