# Relationship history for MSHA mine 2601723

Current hierarchy: **George Ellis & Frank Todd → Thorne Placers Inc → Thorne Placer Mill**

- 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:** Liahona Mining → Thorne Placer Mill; 1981-03-01 to 1983-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Martin Roger D → Thorne Placer Mill; 1981-03-01 to 1983-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Martin Roger D → Liahona Mining; 1981-03-01 to 1983-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Thorne Placers Inc → Thorne Placer Mill; 1983-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George Ellis & Frank Todd → Thorne Placer Mill; 1983-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George Ellis & Frank Todd → Thorne Placers Inc; 1983-03-15 to current/open; source msha-controller-operator-history