# Relationship history for MSHA mine 4102368

Current hierarchy: **Potts Douglas → Stabilized Materials Company → Daley & Holland Plant #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Colorado Rock Company → Daley & Holland Plant #2; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Crutcher-Rolfs-Cummings Inc → Daley & Holland Plant #2; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Crutcher-Rolfs-Cummings Inc → Colorado Rock Company; 1950-01-01 to 1981-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Potts Douglas → Daley & Holland Plant #2; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stabilized Materials Company → Daley & Holland Plant #2; 1981-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Potts Douglas → Stabilized Materials Company; 1981-02-01 to current/open; source msha-controller-operator-history