# Relationship history for MSHA mine 0202380

Current hierarchy: **D L  Campbell Sr → D L Campbell Company Inc → CHENOWETH 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:** D & M Aggregate Inc → CHENOWETH PIT; 1987-07-01 to 1993-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Forrest W  Martinie → CHENOWETH PIT; 1987-07-01 to 1993-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Forrest W  Martinie → D & M Aggregate Inc; 1987-07-01 to 1993-09-27; source msha-controller-operator-history
- **operator_operates_mine:** D L Campbell Company Inc → CHENOWETH PIT; 1993-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** D L  Campbell Sr → CHENOWETH PIT; 1993-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** D L  Campbell Sr → D L Campbell Company Inc; 1993-09-28 to current/open; source msha-controller-operator-history