# Relationship history for MSHA mine 1519879

Current hierarchy: **Steve  Allen; Philip  Marsh → Liberty Technical Services, LLC → Liberty Stone**

- 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:** Rock & Roll Stone LLC → Liberty Stone; 2020-02-05 to 2025-05-14; source msha-controller-operator-history
- **controller_controls_mine:** James D Howard → Liberty Stone; 2020-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D Howard → Rock & Roll Stone LLC; 2020-02-05 to 2025-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Liberty Technical Services, LLC → Liberty Stone; 2025-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Allen et al → Liberty Stone; 2025-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Allen et al → Liberty Technical Services, LLC; 2025-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip  Marsh et al → Liberty Technical Services, LLC; 2025-05-15 to current/open; source msha-controller-operator-history