# Relationship history for MSHA mine 3300172

Current hierarchy: **Colas S A → Barrett Paving Materials Inc. → Lewisburg**

- 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:** Lewisburg Limestone Quarry → Lewisburg; 1950-01-01 to 1981-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Howard H  Schaeffer Jr → Lewisburg; 1950-01-01 to 1981-03-05; source msha-controller-operator-history
- **controller_controls_operator:** Howard H  Schaeffer Jr → Lewisburg Limestone Quarry; 1950-01-01 to 1981-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Lewisburg; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wysong Stone Company → Lewisburg; 1981-03-06 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_mine:** John D  Wysong et al → Lewisburg; 1981-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Wysong et al → Wysong Stone Company; 1981-03-06 to 2021-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Carroll E  Wysong et al → Wysong Stone Company; 1981-03-06 to 2021-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc. → Lewisburg; 2021-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc.; 2021-03-01 to current/open; source msha-controller-operator-history