# Relationship history for MSHA mine 3101236

Current hierarchy: **Jones Rodney G → Jones Marl & Sand Company Inc → Harrietts 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Howell Industries Inc → Harrietts Pit; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Howell Industries Inc → Harrietts Pit; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Howell Industries Inc → Howell Industries Inc; 1950-01-01 to 1978-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Jones Marl & Sand Company Inc → Harrietts Pit; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Rodney G → Harrietts Pit; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Rodney G → Jones Marl & Sand Company Inc; 1978-07-01 to current/open; source msha-controller-operator-history