# Relationship history for MSHA mine 4103446

Current hierarchy: **Boggs Truman → T Boggs Salvage & Backhoe Service Inc → Woodruff Ranch**

- 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:** T Boggs Salvage & Backhoe Service Inc → Woodruff Ranch; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boggs Truman → Woodruff Ranch; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boggs Truman → T Boggs Salvage & Backhoe Service Inc; 1986-12-01 to current/open; source msha-controller-operator-history