# Relationship history for MSHA mine 1300919

Current hierarchy: **CRH PLC → Hallett Materials → PWP #6**

- 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:** Estherville Sand & Gravel Inc → PWP #6; 1950-01-01 to 2000-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Farge Construction Company Inc → PWP #6; 1950-01-01 to 2000-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Farge Construction Company Inc → Estherville Sand & Gravel Inc; 1950-01-01 to 2000-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Matt D  Petersen et al → PWP #6; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → PWP #6; 1999-04-01 to 2001-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Estherville Rock & Gravel → PWP #6; 2000-04-03 to 2002-04-10; source msha-controller-operator-history
- **controller_controls_mine:** Matt D  Petersen et al → PWP #6; 2000-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matt D  Petersen et al → Estherville Rock & Gravel; 2000-04-03 to 2002-04-10; source msha-controller-operator-history
- **controller_controls_operator:** Darrin L  Kruse et al → Estherville Rock & Gravel; 2000-04-03 to 2002-04-10; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PWP #6; 2001-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K P Materials, Inc. → PWP #6; 2002-04-11 to 2005-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Matt D  Petersen et al → K P Materials, Inc.; 2002-04-11 to 2005-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Darrin L  Kruse et al → K P Materials, Inc.; 2002-04-11 to 2005-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials Inc → PWP #6; 2005-09-16 to 2008-01-02; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hallett Materials Inc; 2005-09-16 to 2008-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Hallett Materials Inc; 2005-09-16 to 2001-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → PWP #6; 2008-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → PWP #6; 2008-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hallett Materials; 2008-01-03 to current/open; source msha-controller-operator-history