# Relationship history for MSHA mine 2200771

Current hierarchy: **Gary  Tanner → Tanner Construction Co. Inc. → Monticello G4**

- 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

- **controller_controls_mine:** Gary  Tanner → Monticello G4; 2001-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tanner Construction Co. Inc. → Monticello G4; 2006-10-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Tanner → Tanner Construction Co. Inc.; 2006-10-27 to current/open; source msha-controller-operator-history