# Relationship history for MSHA mine 4502592

Current hierarchy: **C A  Marchand → Sunbelt Construction Inc → Airmans Beech 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:** Western Excavation & Landscaping → Airmans Beech Pit; 1978-12-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Davis Mike → Airmans Beech Pit; 1978-12-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Davis Mike → Western Excavation & Landscaping; 1978-12-01 to 1980-02-29; source msha-controller-operator-history
- **controller_controls_mine:** C A  Marchand → Airmans Beech Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunbelt Construction Inc → Airmans Beech Pit; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C A  Marchand → Sunbelt Construction Inc; 1980-03-01 to current/open; source msha-controller-operator-history