# Relationship history for MSHA mine 0502783

Current hierarchy: **Holcim Ltd → Lafarge West Incorporated → Hinkhouse Pit**

- 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:** Andrews Sand & Gravel → Hinkhouse Pit; 1950-01-01 to 2001-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Ortis  Andrews → Hinkhouse Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ortis  Andrews → Andrews Sand & Gravel; 1950-01-01 to 2001-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Hinkhouse Pit; 1998-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Southern Inc → Hinkhouse Pit; 2001-04-19 to 2002-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Southern Inc; 2001-04-19 to 2002-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West Incorporated → Hinkhouse Pit; 2002-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Hinkhouse Pit; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West Incorporated; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Hinkhouse Pit; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West Incorporated; 2015-07-10 to current/open; source msha-controller-operator-history