# Relationship history for MSHA mine 3601997

Current hierarchy: **Harman John E → Hard & Shiney Coal Company Inc → Morgan Drift Mine**

- 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

- **operator_operates_mine:** Shade & Company → Morgan Drift Mine; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Shade Gary L & James--Homer J Morgan → Morgan Drift Mine; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Shade Gary L & James--Homer J Morgan → Shade & Company; 1950-01-01 to 1975-12-17; source msha-controller-operator-history
- **operator_operates_mine:** Hard & Shiney Coal Company Inc → Morgan Drift Mine; 1975-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harman John E → Morgan Drift Mine; 1975-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harman John E → Hard & Shiney Coal Company Inc; 1975-12-18 to current/open; source msha-controller-operator-history