# Relationship history for MSHA mine 3303461

Current hierarchy: **Hooper Floyd → Hooper Mining → Leishman**

- 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:** H & L Mining Inc → Leishman; 1976-02-01 to 1976-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Hooper Floyd Et Al → Leishman; 1976-02-01 to 1976-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Hooper Floyd Et Al → H & L Mining Inc; 1976-02-01 to 1976-11-22; source msha-controller-operator-history
- **operator_operates_mine:** Leishman Brothers & Son → Leishman; 1976-11-23 to 1980-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Leishman Arthur → Leishman; 1976-11-23 to 1980-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Leishman Arthur → Leishman Brothers & Son; 1976-11-23 to 1980-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Hooper Mining → Leishman; 1980-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hooper Floyd Et Al → Leishman; 1980-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hooper Floyd Et Al → Hooper Mining; 1980-02-14 to current/open; source msha-controller-operator-history