US Patent Class 291-- TRACK SANDERS

US Patent Class 291
TRACK SANDERS

	DF	CLASS NOTES
1	DF	MISCELLANEOUS
2	DF	WHEEL-SLIP CONTROL
3	DF	FLUID DELIVERY
4	DF	.~ Smoke and cinder
5	DF	.~ Reversing
6	DF	.~ Movable trap valve
7	DF	.~ Gravity conversion
8	DF	.~.~ Bypass
9	DF	.~.~ Horizontal trap axis
10	DF	.~.~ Vertical trap axis
11.1	DF	.~ Including sand trap
11.2	DF	.~.~ Multiple fluid inlets for delivery pipe
11.3	DF	.~.~ Specified means to alter inlet fluid flow
12	DF	.~ Blast-nozzle cleaners
13	DF	.~ Air ports and screens
14	DF	BRAKE-HANDLE CONTROL
15	DF	BRAKE-SYSTEM CONTROL
16	DF	HAND-VALVE CONTROL
17	DF	ALARMS
18	DF	JET IN HOPPER
19	DF	HEATERS
20	DF	.~ Electric
21	DF	.~ Steam
22	DF	POWER-ACTUATED
23	DF	.~ Electric
24	DF	.~ Fluid
25	DF	SAND FEEDERS
26	DF	.~ Reversing
27	DF	.~ Chain
28	DF	.~ Oscillatory
29	DF	.~.~ Cup
30	DF	.~.~ Hopper
31	DF	.~.~ Spout cutoff
32	DF	.~ Rotary
33	DF	.~ Screw
34	DF	.~ Longitudinal slide
35	DF	.~ Pivoted slide
36	DF	.~ Vertical plunger
37	DF	.~.~ Helical guide
38	DF	SAND HOPPERS
39	DF	.~ Wheel guard
40	DF	.~ Dome
41	DF	SAND-DELIVERY PIPE
42	DF	.~ Cleaners
43	DF	.~.~ Fluid
44	DF	.~ Flexible
45	DF	.~ Telescopic
46	DF	.~ Nozzles
47	DF	.~.~ Pivoted
48	DF	SAND SCREENS