Vacuum servo system and the like

Claim 1

A COMBINATION FOR USE WITH A VACUUM SOURCE OF ACTUATING FLUID UNDER VACUUM CONDITION AND THE LIKE: A MASTER CONTROLLER HAVING A MASTER VACUUM CHAMBER CONNECTABLE TO SAID VACUUM SOURCE IN ACTUATING FLUID FLOW RELATIONSHIP; FIRST MEANS AUTOMATICALLY MAINTAINING ACTUATING FLUID IN SAID MASTER VACUUM CHAMBER AT A CONTROLLED VACUUM CONDITION; A SLAVE MEMBER HAVING A SLAVE VACUUM CHAMBER CONNECTED IN ACTUATING FLUID FLOW RELATIONSHIP TO SAID MASTER VACUUM CHAMBER; AND A SLAVE ACTUATING MEANS OPERATING IN RESPONSE TO VACUUM CONDITION OF ACTUATING FLUID IN SAID SLAVE VACUUM CONDITION OF ACTUATING FLUID IN SAID SLAVE VACUUM CHAMBER IN WHICH COMBINATION SAID FIRST MEANS IS ADJUSTABLE TO PRODUCE A PLURALITY OF DIFFERENT CONTROLLED VACUUM CONDITIONS IN SAID MASTER VACUUM CHAMBER AND IN WHICH SAID SLAVE VACUUM CHAMBER IS RESILIENTLY HERMETICALLY SEALED WITH PRESSURE CHARACTERISTICS TO RESIST CONTRACTION BY THE VACUUM CONDITIONS IN SAID SLAVE VACUUM CHAMBER, AND IN WHICH SAID SECOND MEANS IS A RESILIENT SECOND MEANS OUTSIDE SAID SLAVE VACUUM CHAMBER AND IS ADJUSTABLE OUTSIDE SAID SLAVE VACUUM CHAMBER TO VARY THE RESPONSE OF SAID PRESSURE CHARACTERISTICS TO VACUUM CONDITION IN SAID SLAVE VACUUM CHAMBER INDEPENDENTLY OF SAID FIRST MEANS.