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Subject
- Police--Uniforms.[remove]2
- Criminal justice, Administration of--California.1
- Criminal justice, Administration of.1
- Law enforcement.1
- Police communication systems.1
- Police--United States.1
- Police.1
- Radio broadcasting.1
- Radio--History--20th century.1
- Sam Browne belts.1
- Speeches, addresses, etc., American.1
- Technological innovations.1
- Traffic flow.1
- Traffic safety.1