# Relationship history for MSHA mine 4104949

Current hierarchy: **Matt  Mills; Kirk  Mills → Mills Crushed Stone Co. → Comanche Co. 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:** Keith  Mills → Comanche Co. Pit; 1993-07-01 to 2017-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Mills Crushed Stone Co. → Comanche Co. Pit; 2012-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Mills → Mills Crushed Stone Co.; 2012-05-31 to 2017-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Kirk  Mills et al → Comanche Co. Pit; 2017-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk  Mills et al → Mills Crushed Stone Co.; 2017-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt  Mills et al → Mills Crushed Stone Co.; 2017-07-13 to current/open; source msha-controller-operator-history