# Relationship history for MSHA mine 4104261

Current hierarchy: **Bill  Mezger; Ben  Goodwin → Mezger Ent.  LTD. → M 3**

- 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:** Tom  Alkusari → M 3; 1997-09-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alkusari Texas Limestone Corp → M 3; 2000-07-01 to 2002-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Alkusari → Alkusari Texas Limestone Corp; 2000-07-01 to 2002-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Mezger Ent.  LTD. → M 3; 2002-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ben  Goodwin  et al → M 3; 2002-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ben  Goodwin  et al → Mezger Ent.  LTD.; 2002-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Mezger  et al → Mezger Ent.  LTD.; 2002-03-18 to current/open; source msha-controller-operator-history