# Relationship history for MSHA mine 3102165

Current hierarchy: **Wiley B  Roark → Maymead Materials, Inc. → North 321 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

- **controller_controls_mine:** Wiley B  Roark et al → North 321 Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North 321 Stone Co., Inc. → North 321 Stone; 2000-12-01 to 2012-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Bob G  Oxford → North 321 Stone; 2000-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob G  Oxford → North 321 Stone Co., Inc.; 2000-12-01 to 2012-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Maymead Materials, Inc. → North 321 Stone; 2012-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wiley B  Roark et al → Maymead Materials, Inc.; 2012-02-14 to current/open; source msha-controller-operator-history