# Relationship history for MSHA mine 2002365

Current hierarchy: **John W  Wells; Karen S  Wells → Wells Sand & Gravel → Wells Gravel Pit**

- 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:** Cliff Brownell Sand & Gravel → Wells Gravel Pit; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Brownell Cliff → Wells Gravel Pit; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Brownell Cliff → Cliff Brownell Sand & Gravel; 1950-01-01 to 1982-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Wells Sand & Gravel → Wells Gravel Pit; 1982-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Wells et al → Wells Gravel Pit; 1982-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Wells et al → Wells Sand & Gravel; 1982-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karen S  Wells et al → Wells Sand & Gravel; 1982-12-28 to current/open; source msha-controller-operator-history