# Relationship history for MSHA mine 0202767

Current hierarchy: **The Michael & Ashia Stone Revocable Trust; The Robert & Denise Swartzman → S&S Concrete & Materials, LLC → Pass Canyon**

- 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:** Tri-R Construction Inc → Pass Canyon; 1998-05-01 to 2004-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Debra  Hurns → Pass Canyon; 2002-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debra  Hurns → Tri-R Construction Inc; 2002-05-15 to 2004-07-13; source msha-controller-operator-history
- **operator_operates_mine:** S&S Concrete & Materials, LLC → Pass Canyon; 2004-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Swartzman et al → Pass Canyon; 2004-07-14 to 2022-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Swartzman et al → S&S Concrete & Materials, LLC; 2004-07-14 to 2022-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Stone et al → S&S Concrete & Materials, LLC; 2004-07-14 to 2022-07-13; source msha-controller-operator-history
- **controller_controls_mine:** The Robert & Denise Swartzman Family Trust et al → Pass Canyon; 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, LLC; 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, LLC; 2022-07-14 to current/open; source msha-controller-operator-history