# Relationship history for MSHA mine 1201692

Current hierarchy: **Moster Eddie G → Liberty Sand & Gravel Inc → Liberty Sand & Gravel Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Union County Materials Inc → Liberty Sand & Gravel Incorporated; 1979-01-01 to 1983-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Sauser Jo Ann → Liberty Sand & Gravel Incorporated; 1979-01-01 to 1983-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Sauser Jo Ann → Union County Materials Inc; 1979-01-01 to 1983-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Sand & Gravel Inc → Liberty Sand & Gravel Incorporated; 1983-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Moster Eddie G → Liberty Sand & Gravel Incorporated; 1983-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moster Eddie G → Liberty Sand & Gravel Inc; 1983-08-17 to current/open; source msha-controller-operator-history