which induction coil do these phones use?

[RB]

Hi All.
I have a list of phones i will be using as examples, because they are simple, and mostly, similar to each other.
I need to know what ind coil they each use, and ultimately, the impedance values of each.
These samples need to be compatible with each other, or I need to know why they are not...so I can alter them, or dump them from the group.
Here is what I have found...
AE200
WE301A
SC1245??
Fed 804
Leich 901B
EE-8
315/317
This is all the info I have on them. I have the schematics, but no ind coil info.
Thanks in advance! any help here would be awesome!