# Relationship history for MSHA mine 2100796

Current hierarchy: **Michael D Luukkonen → NTT of Minnesota Inc → Finlay-2**

- 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:** M A Hanna Company → Finlay-2; 1950-01-01 to 1990-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Hanna M A Company → Finlay-2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanna M A Company → M A Hanna Company; 1950-01-01 to 1990-03-27; source msha-controller-operator-history
- **operator_operates_mine:** N T T Of Minnesota Inc → Finlay-2; 1990-03-28 to 1992-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Lloyd  Jones → Finlay-2; 1990-03-28 to 1992-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd  Jones → N T T Of Minnesota Inc; 1990-03-28 to 1992-08-17; source msha-controller-operator-history
- **operator_operates_mine:** NTT of Minnesota Inc → Finlay-2; 1992-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael D Luukkonen → Finlay-2; 1992-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D Luukkonen → NTT of Minnesota Inc; 1992-08-18 to current/open; source msha-controller-operator-history