# Relationship history for MSHA mine 2400016

Current hierarchy: **T Patrick  O'Hara → Montana Travertine → TRAVERTINE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Livingston Marble & Granite → TRAVERTINE QUARRY; 1950-01-01 to 1986-01-16; source msha-controller-operator-history
- **controller_controls_mine:** H Weslry  Strong et al → TRAVERTINE QUARRY; 1950-01-01 to 1999-03-10; source msha-controller-operator-history
- **controller_controls_operator:** H Weslry  Strong et al → Livingston Marble & Granite; 1950-01-01 to 1986-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Livingston Marble & Granite Works → TRAVERTINE QUARRY; 1986-01-17 to 1987-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Wilcox et al → TRAVERTINE QUARRY; 1986-01-17 to 1987-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Wilcox et al → Livingston Marble & Granite Works; 1986-01-17 to 1987-01-15; source msha-controller-operator-history
- **operator_operates_mine:** Livingston Marble & Granite → TRAVERTINE QUARRY; 1987-01-16 to 1999-03-10; source msha-controller-operator-history
- **controller_controls_operator:** H Weslry  Strong et al → Livingston Marble & Granite; 1987-01-16 to 1999-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Montana Travertine → TRAVERTINE QUARRY; 1999-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T Patrick  O'Hara → TRAVERTINE QUARRY; 1999-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T Patrick  O'Hara → Montana Travertine; 1999-03-11 to current/open; source msha-controller-operator-history