The codes below display in the CL: Classification field.

The “general” classification codes are searchable. For example, to search for records on circuits in general, enter

cl=10

To search for records on electric circuits, enter

cl=11

To search for all records with classification codes beginning with 1 (i.e., classification code 10 and all its subheadings), enter

cl=1*

10 Circuits (General)

11 Electric Circuits

12 Electronic Circuits

13 Computer Circuits

20 Components and Materials (General)

21 Electric Components and Materials

22 Electronic Components and Materials

23 Computer Components and Materials

30 Photonics (General)

31 Lasers

32 Optics

33 Light

34 Vision

40 Control and Systems (General)

41 Computer Control

42 Microcontrollers

43 Guidance Systems

44 Robotic Systems

45 Control Devices

50 50 Telecommunications (General)

51 Telephone and Other Line Communications

52 Television Communications

53 Radio Communications

54 Radar Communications

60 Telecommunications Equipment and Instrumentation (General)

61 Telephone and Other Line Equipment and Instrumentation

62 Television Equipment and Instrumentation

63 Radio Equipment and Instrumentation

64 Radar Equipment and Instrumentation

70 Power Systems (General)

71 Electric Machinery, Generators, and Motors

72 Electric Batteries

73 Fuel Cells

74 Solar Cells

80 Theoretical (General)

81 Electromagnetic Waves

82 Acoustic Waves

83 Electricity

84 Magnetism

90 Electronics and Communications Milieux (General)

91 The Electronics and Communications Industry

92 History of Electronics and Communications

93 Electronics and Communications Education

94 Management of Electronics and Communications Systems