# Relationship history for MSHA mine 1401508

Current hierarchy: **John B  Musser II → Konza Construction Company Inc → Plant 9300**

- 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:** More Sand Company Inc → Plant 9300; 1987-05-01 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Roy G  More → Plant 9300; 1987-05-01 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Roy G  More → More Sand Company Inc; 1987-05-01 to 1991-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Konza Construction Company Inc → Plant 9300; 1991-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John B  Musser II et al → Plant 9300; 1991-04-16 to 2013-01-09; source msha-controller-operator-history
- **controller_controls_operator:** John B  Musser II et al → Konza Construction Company Inc; 1991-04-16 to 2013-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Doug W.  Hutchinson → Plant 9300; 2013-01-10 to 2013-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Doug W.  Hutchinson → Konza Construction Company Inc; 2013-01-10 to 2013-03-14; source msha-controller-operator-history
- **controller_controls_mine:** John B  Musser II et al → Plant 9300; 2013-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John B  Musser II et al → Konza Construction Company Inc; 2013-03-15 to current/open; source msha-controller-operator-history