# Relationship history for MSHA mine 1800742

Current hierarchy: **Chaney Enterprises LP → Mike Davidson Sand & Gravel LLC → MICHAEL P. DAVIDSON PIT #2**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Michael P  Davidson → MICHAEL P. DAVIDSON PIT #2; 1996-08-01 to 2004-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Mike Davidson Sand & Gravel Llc → MICHAEL P. DAVIDSON PIT #2; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael P  Davidson → Mike Davidson Sand & Gravel Llc; 1997-08-01 to 2004-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Chaney Enterprises LP → MICHAEL P. DAVIDSON PIT #2; 2004-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Enterprises LP → Mike Davidson Sand & Gravel Llc; 2004-05-28 to current/open; source msha-controller-operator-history