Sorry but this book in no longer avaiable.
If you ever wanted to know more about Interchangeable Core Cylinders, this is a great
book to start with.
This book covers the following:
Best/Falcon/Arrow/Eagle (A2)
Best A3
Best A4
Corbin X Removable Core
Corbin Z Removable Core
Russwin Removable Core
Emhart System 70 Removable Core
Sargent Removable Core
Schlage, Yale, Lockwood
Medeco Removable Core