# Relationship history for MSHA mine 1301825

Current hierarchy: **CRH PLC → Hallett Materials → Stripping  #1**

- 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:** Hallett Construction Company → Stripping  #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Construction Company → Stripping  #1; 1978-03-09 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Hallett Construction Company → Hallett Construction Company; 1978-03-09 to 1986-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Mid America Materials Company → Stripping  #1; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Stripping  #1; 1986-10-14 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1986-10-14 to 1999-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials Inc → Stripping  #1; 1999-04-01 to 2008-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Rasmussen Group Inc → Stripping  #1; 1999-04-01 to 2001-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Rasmussen Group Inc → Hallett Materials Inc; 1999-04-01 to 2001-08-10; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Stripping  #1; 2001-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hallett Materials Inc; 2001-08-11 to 2008-01-03; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Stripping  #1; 2008-01-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Stripping  #1; 2008-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hallett Materials; 2008-01-04 to current/open; source msha-controller-operator-history