# Relationship history for MSHA mine 1519398

Current hierarchy: **Ronnie  Gadberry; Robert J  Warren → Conceptual Stone Inc. → Conceptual Stone Inc.**

- 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:** Conceptual Stone Inc. → Conceptual Stone Inc.; 2009-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie  Gadberry et al → Conceptual Stone Inc.; 2009-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie  Gadberry et al → Conceptual Stone Inc.; 2009-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert J  Warren et al → Conceptual Stone Inc.; 2009-04-06 to current/open; source msha-controller-operator-history