# Relationship history for MSHA mine 2901975

Current hierarchy: **Tom  Turner → San Man → San Man**

- 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:** Cooper Enterprises → San Man; 1984-11-01 to 1995-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Cooper  et al → San Man; 1984-11-01 to 1995-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Cooper  et al → Cooper Enterprises; 1984-11-01 to 1995-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Blair Turner Construction → San Man; 1995-02-28 to 2001-02-14; source msha-controller-operator-history
- **controller_controls_mine:** William B  Turner  et al → San Man; 1995-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William B  Turner  et al → Blair Turner Construction; 1995-02-28 to 2001-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Jaqueline  Blair  et al → Blair Turner Construction; 1995-02-28 to 2001-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Blair  et al → Blair Turner Construction; 1995-02-28 to 2001-02-14; source msha-controller-operator-history
- **operator_operates_mine:** San Man → San Man; 2001-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Turner → San Man; 2001-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Turner → San Man; 2001-02-15 to current/open; source msha-controller-operator-history