# Relationship history for MSHA mine 3502437

Current hierarchy: **Richard L  Gilliland → Rock Process Inc → Camp Abbot 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:** Mid Oregon Oil Company → Camp Abbot Pit; 1950-01-01 to 1978-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Mid Oregon Oil Company → Camp Abbot Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mid Oregon Oil Company → Mid Oregon Oil Company; 1950-01-01 to 1978-11-08; source msha-controller-operator-history
- **controller_controls_mine:** United States Government → Camp Abbot Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Forest Service → Camp Abbot Pit; 1978-11-09 to 1979-08-08; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1978-11-09 to 1979-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Rock Process Inc → Camp Abbot Pit; 1979-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Gilliland → Camp Abbot Pit; 1979-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Gilliland → Rock Process Inc; 1979-08-09 to current/open; source msha-controller-operator-history