# Relationship history for MSHA mine 4003037

Current hierarchy: **Harvey E  Ward → Kew Mining #2 → Low Gap #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Kew Mining #2 → Low Gap #1; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harvey E  Ward et al → Low Gap #1; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harvey E  Ward et al → Kew Mining #2; 1991-04-01 to current/open; source msha-controller-operator-history