# Relationship history for MSHA mine 2300108

Current hierarchy: **Holcim Ltd → Lafarge North America Inc. → PETTIS QUARRY**

- 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:** Howard Quarries Inc → PETTIS QUARRY; 1950-01-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Howard Olen → PETTIS QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Olen → Howard Quarries Inc; 1950-01-01 to 1997-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → PETTIS QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Corp → PETTIS QUARRY; 1997-04-04 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Corp; 1997-04-04 to 2001-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → PETTIS QUARRY; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge North America Inc. → PETTIS QUARRY; 2001-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge North America Inc.; 2001-09-01 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → PETTIS QUARRY; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge North America Inc.; 2015-07-10 to current/open; source msha-controller-operator-history