Usage of IBM name in textbook

[Robert R. Hood]

I want to use the names of major companies in my textbook. I want to show sample letters. The book is about writing.

There are 120 letters, and I have been told that staff attorneys at companies like Ford will give me kneejerk rejections.

Can I get by with a mass disclaimer? Or how can I protect myself?
Thanks

 

[HomeGuru]

Why do you have to use the names of major companies? What is the purpose?
For sample letters, you can use made up company names.

 

[Robert R. Hood]

Use of IBM name in textbook

Students pay about 1,000% more interest to things that have a "real" image to them. Phoney names just don't generate the interest of the real thing. This methodology is to increase student interest, and thus student learning. A legal case involving whatever black man doesn't have the interest of the O.J. Simpson trial.

The normal standard for a 10 chapter text is to use ten companies, and contact them for permission. But with 120 it would become a logistical nightmare, especially because I am in Latin America and the mail service is a disaster. Thanks