# Relationship history for MSHA mine 0901051

Current hierarchy: **Mathews Eugene A → Mathews Granite Inc → Pine Creek**

- 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:** Mathews Eugene A → Pine Creek; 1985-09-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pine Creek Quarries Inc → Pine Creek; 1990-06-01 to 1991-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Dietz Memorial Company Inc → Pine Creek; 1990-06-01 to 1991-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Dietz Memorial Company Inc → Pine Creek Quarries Inc; 1990-06-01 to 1991-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Mathews Granite Inc → Pine Creek; 1991-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathews Eugene A → Mathews Granite Inc; 1991-04-05 to current/open; source msha-controller-operator-history