# Relationship history for MSHA mine 2602305

Current hierarchy: **Earl D  Harrison; Laraine  Griesel → Western Mine Development → MANHATTAN MILL SITE**

- 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:** New Concept Mining Inc → MANHATTAN MILL SITE; 1995-06-01 to 2000-07-02; source msha-controller-operator-history
- **controller_controls_mine:** American Technologies Group Inc → MANHATTAN MILL SITE; 1995-06-01 to 2000-07-02; source msha-controller-operator-history
- **controller_controls_operator:** American Technologies Group Inc → New Concept Mining Inc; 1995-06-01 to 2000-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Laraine  Griesel et al → MANHATTAN MILL SITE; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mine Development → MANHATTAN MILL SITE; 2000-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laraine  Griesel et al → Western Mine Development; 2000-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl D  Harrison et al → Western Mine Development; 2000-07-03 to current/open; source msha-controller-operator-history