# Relationship history for MSHA mine 4102777

Current hierarchy: **Edahl Leland → Albuquerque Uranium Corp → Lamprecht Mine**

- 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:** Iec Corp → Lamprecht Mine; 1978-03-09 to 1991-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Ludt R E → Lamprecht Mine; 1978-03-09 to 1991-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Ludt R E → Iec Corp; 1978-03-09 to 1991-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Albuquerque Uranium Corp → Lamprecht Mine; 1991-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edahl Leland → Lamprecht Mine; 1991-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edahl Leland → Albuquerque Uranium Corp; 1991-05-14 to current/open; source msha-controller-operator-history