Carl Haddon recent article for Fire Apparatus Magazine:

Are Your Hydraulic Extrication Tools and Your Extrication Program Instructor Compatible?
If your current rescue tools and your extrication training program are both 15 to 20 years old or older, then the answer to my question of compatibility is a resounding, "Yes," they are most likely compatible. Otherwise, you might be surprised. (Note: Fasten your seat belts, because this one is probably going to get me in trouble.) >Read More