The dry chemical in a partially used extinguisher will cause the gas to leak away. If needed later, the fire extinguisher probably would not have pressure. To eliminate the need for extinguishers for all three classes, install at least one 20-pound ABC Class extinguisher in a convenient location, and possibly more, depending on the size of the shop. Don't take the use of handtools and service for granted. You're more likely to be injured when servicing equipment than when operating it.
Power tools can inflict sudden, severe injury.
Even small handtools can cause serious damage. To follow all the rules necessary to insure farmshop safety requires more information than can be included in this MontGuide. Several publications on handtool and power tool safety arc available from bookstores and libraries that describe the proper use and care of handtools. Study them and follow their recommendations. Chisels and Punches.