21.   Lederle Laboratories and North American Vaccine Inc. also developed versions of the experimental vaccine.

22.   Looking to spice up its aging and immensely profitable instant film, Polaroid Corp. has developed a version that is five times faster.

23.   Maxygen is developing improved versions of proteins that are already being sold as drugs by other companies, posing a potential threat to other biotech companies.

24.   Microunity has already developed prototype versions of cable set-top boxes and cable network modems as well as computer work stations that are based on the Mediaprocessor.

25.   Nearly a dozen drug companies are developing inhaled versions of, and breathing devices for, drugs patients now take by needle.

26.   Now suppose Microsoft had to disclose the code and technical information Windows applications require, and keep doing so as it developed new versions.

27.   Nuckols now wants to develop a version to fit into submersibles.

28.   Now suppose Microsoft had to disclose the code and technical information Windows applications require, and to keep doing so as it developed new versions.

29.   One spot to search for digital textbooks is Wizeup, at www.wizeup.com, which is developing online versions of books from Houghton Mifflin, W.W. Norton and other publishers.

30.   Relational database makers Informix and Oracle also are reported to be developing Linux versions.