# Relationship history for MSHA mine 2900473

Current hierarchy: **Charles  Hamilton → Southwest Concrete & Paving Inc → MIMBRES PIT**

- 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:** Southwest Sand & Gravel Inc → MIMBRES PIT; 1950-01-01 to 1994-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Gad Lee → MIMBRES PIT; 1950-01-01 to 1994-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Gad Lee → Southwest Sand & Gravel Inc; 1950-01-01 to 1994-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Concrete & Paving Inc → MIMBRES PIT; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Hamilton → MIMBRES PIT; 1994-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Hamilton → Southwest Concrete & Paving Inc; 1994-05-01 to current/open; source msha-controller-operator-history