# Relationship history for MSHA mine 4300437

Current hierarchy: **Chico Gregory → Greg Chico'S Trucking → Parker'S Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Greg Chico'S Trucking → Parker'S Pit; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Chico Gregory → Parker'S Pit; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chico Gregory → Greg Chico'S Trucking; 1989-10-01 to current/open; source msha-controller-operator-history