# Relationship history for MSHA mine 3002608

Current hierarchy: **Burton Scott Clark → Burton F Clark Inc → Hale 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

- **controller_controls_mine:** Burton Scott Clark → Hale Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Barry Hale Gravel → Hale Pit; 1981-07-01 to 1987-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Hale Barry → Hale Pit; 1981-07-01 to 1987-01-07; source msha-controller-operator-history
- **controller_controls_operator:** Hale Barry → Barry Hale Gravel; 1981-07-01 to 1987-01-07; source msha-controller-operator-history
- **operator_operates_mine:** Burton F Clark Inc → Hale Pit; 1987-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burton Scott Clark → Burton F Clark Inc; 1987-01-08 to current/open; source msha-controller-operator-history