# Relationship history for MSHA mine 2902375

Current hierarchy: **Bill H  Tenore; Mike L  Lockwood → T - LOCK STONE LLC → TLS 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** T - LOCK STONE LLC → TLS 1; 2008-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike L  Lockwood et al → TLS 1; 2008-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike L  Lockwood et al → T - LOCK STONE LLC; 2008-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill H  Tenore et al → T - LOCK STONE LLC; 2008-06-23 to current/open; source msha-controller-operator-history