# Relationship history for MSHA mine 0203321

Current hierarchy: **The Michael & Ashia Stone Revocable Trust; The Robert & Denise Swartzman → S&S Concrete & Materials → Fort Mohave**

- 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

- **controller_controls_mine:** Michael  Stone et al → Fort Mohave; 2004-07-14 to 2022-07-13; source msha-controller-operator-history
- **operator_operates_mine:** S&S Concrete & Materials → Fort Mohave; 2013-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Stone et al → S&S Concrete & Materials; 2013-06-26 to 2022-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Swartzman et al → S&S Concrete & Materials; 2013-06-26 to 2022-07-13; source msha-controller-operator-history
- **controller_controls_mine:** The Michael & Ashia Stone Revocable Trust et al → Fort Mohave; 2022-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Michael & Ashia Stone Revocable Trust et al → S&S Concrete & Materials; 2022-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** The Robert & Denise Swartzman Family Trust et al → S&S Concrete & Materials; 2022-07-14 to current/open; source msha-controller-operator-history