# Relationship history for MSHA mine 1301671

Current hierarchy: **Tony  Thier → BARD Materials → Stationary Sand 1**

- 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

- **controller_controls_mine:** Dennis J  Thier et al → Stationary Sand 1; 1950-01-01 to 2014-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Bellevue Sand & Gravel Co → Stationary Sand 1; 1950-01-01 to 2025-03-10; source msha-controller-operator-history
- **controller_controls_mine:** John L  Schneider → Stationary Sand 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Schneider → Bellevue Sand & Gravel Co; 1950-01-01 to 2025-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Tony  Thier → Stationary Sand 1; 2014-03-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BARD Materials → Stationary Sand 1; 2025-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony  Thier → BARD Materials; 2025-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis J  Thier et al → BARD Materials; 2025-03-11 to 2014-03-02; source msha-controller-operator-history