(under the class definition) Subject matter comprising devices not otherwise provided for to prevent explosions or injury to boilers.
SEE OR SEARCH THIS CLASS, SUBCLASS:
125, 164, 364, 437, 447, 450, and 490, for tilting boilers.
493, for braces and stays.
494, and 495, for different types of safety devices in this class.
510, for supports.
SEE OR SEARCH CLASS 55, Gas Separation,
309+, for separator bypass or gas pressure relief means.
73, Measuring and Testing,
290+, for liquid level or depth gauges.
96, Gas Separation: Apparatus,
399+, for gas separation apparatus having automatic control means for gas cutoff or diversion.
126, Stoves and Furnaces,
35, for safety valves.
137, Fluid Handling,
455+, for line condition change responsive valves, particularly subclasses 460, 486+ and 498 for valves which close in response to an excessive flow as when the line breaks.
165, Heat Exchange, 279+, for a heat exchanger with a pressure or temperature responsive device, and subclass 134.1 for a heat exchanger with a protective device.
200, Electricity: Circuit Makers and Breakers,
84, for special safety switches.
220, Receptacles, for diaphragms for boilers and tanks that break under a given pressure and for boiler manholes and closures with safety attachments.
236, Automatic Temperature and Humidity Regulation,
53, for related art.
237, Heating Systems,
80, for steam traps that are heated to prevent freezing.
261, Gas and Liquid Contact Apparatus, for safety devices for condensers.
411, Expanded, Threaded, Driven, Headed, Tool-Deformed, or Locked-Threaded Fasteners
367, and 370, respectively, for a threaded fastener and nut having a stay bolt spacer sleeve or having a stay bolt bearing washer; and subclasses 379+ for a threaded stay bolt per se; and subclass 505 for an unthreaded stay bolt, per se.
