Vertical grip ?

[Bo-Ming Tong]

Am I understanding correctly that only the following 3 cameras have 
genuine vertical grips ? By that I mean a vertical grip with a shutter 
release button.

MZ-S
*ist
*ist D
The other cameras in the MZ/ZX series do not have a vertical grip but 
only a battery holder, right ?

Thanks

Bo-Ming Tong