# Relationship history for MSHA mine 1002061

Current hierarchy: **Dennis C  Virgin; Alan L  Taylor → T.V. Gravel Products → T.V. Gravel Products #2**

- 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

- **controller_controls_mine:** Dennis C  Virgin et al → T.V. Gravel Products #2; 2001-09-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T.V. Gravel Products → T.V. Gravel Products #2; 2004-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis C  Virgin et al → T.V. Gravel Products; 2004-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan L  Taylor et al → T.V. Gravel Products; 2004-10-04 to current/open; source msha-controller-operator-history