# Relationship history for MSHA mine 1401574

Current hierarchy: **Blayne  Martin → Martin Central Sand Company Inc → Martin Central Sand Company Inc**

- 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

- **operator_operates_mine:** Central Sand Company Inc → Martin Central Sand Company Inc; 1993-09-01 to 2010-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Scott A  Hoskinson → Martin Central Sand Company Inc; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott A  Hoskinson → Central Sand Company Inc; 1993-09-01 to 2010-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Martin Central Sand Company Inc → Martin Central Sand Company Inc; 2010-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Martin → Martin Central Sand Company Inc; 2010-06-18 to 2025-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Martin → Martin Central Sand Company Inc; 2010-06-18 to 2025-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Blayne  Martin → Martin Central Sand Company Inc; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blayne  Martin → Martin Central Sand Company Inc; 2026-01-01 to current/open; source msha-controller-operator-history