# Relationship history for MSHA mine 2601488

Current hierarchy: **Hanson PLC → Hanson Aggregates-Las Vegas Inc → STEPHANIE**

- 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:** Bonanza Materials Inc → STEPHANIE; 1978-03-09 to 1981-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Wood Lalif → STEPHANIE; 1978-03-09 to 1981-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Wood Lalif → Bonanza Materials Inc; 1978-03-09 to 1981-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Bonanza Materials Inc → STEPHANIE; 1981-07-14 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Pollock Gary & Beverly → STEPHANIE; 1981-07-14 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Pollock Gary & Beverly → Bonanza Materials Inc; 1981-07-14 to 1982-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Bonanza Materials Inc → STEPHANIE; 1982-06-01 to 1988-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Industrial Construction Inc → STEPHANIE; 1982-06-01 to 1988-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Industrial Construction Inc → Bonanza Materials Inc; 1982-06-01 to 1988-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates-Las Vegas Inc → STEPHANIE; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → STEPHANIE; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates-Las Vegas Inc; 1988-09-01 to current/open; source msha-controller-operator-history