# Relationship history for MSHA mine 0401977

Current hierarchy: **Mary  Coulter; Joseph  Coulter → Thomes Creek Rock Company Inc → Thomes Creek Rock Co Inc**

- 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:** Ray Willis Aggregate Supplies → Thomes Creek Rock Co Inc; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Willis → Thomes Creek Rock Co Inc; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Willis → Ray Willis Aggregate Supplies; 1950-01-01 to 1984-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Atlas Ii Sand & Gravel → Thomes Creek Rock Co Inc; 1984-07-19 to 1986-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Robert K  Murchland → Thomes Creek Rock Co Inc; 1984-07-19 to 1986-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Robert K  Murchland → Atlas Ii Sand & Gravel; 1984-07-19 to 1986-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Thomes Creek Rock Company Inc → Thomes Creek Rock Co Inc; 1986-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mary  Coulter et al → Thomes Creek Rock Co Inc; 1986-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Coulter et al → Thomes Creek Rock Company Inc; 1986-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Coulter et al → Thomes Creek Rock Company Inc; 1986-04-09 to current/open; source msha-controller-operator-history