# Relationship history for MSHA mine 4800293

Current hierarchy: **Charles  Fryburger; Kent  Pulley → Rawlins Sand & Gravel Company → Rawlins Sand & Gravel Company**

- 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:** Rawlins Sand & Gravel Company → Rawlins Sand & Gravel Company; 1950-01-01 to 1984-11-05; source msha-controller-operator-history
- **controller_controls_mine:** River Enterprises → Rawlins Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** River Enterprises → Rawlins Sand & Gravel Company; 1950-01-01 to 1984-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Rawlins Sand & Gravel Company → Rawlins Sand & Gravel Company; 1984-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Fryburger  et al → Rawlins Sand & Gravel Company; 1984-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Fryburger  et al → Rawlins Sand & Gravel Company; 1984-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kent  Pulley  et al → Rawlins Sand & Gravel Company; 1984-11-06 to current/open; source msha-controller-operator-history