# Relationship history for MSHA mine 1001885

Current hierarchy: **(Paul) Mike  Mulchay → Mike'S Sand & Gravel Inc → MIKE'S SAND & GRAVEL, INC.**

- 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

- **operator_operates_mine:** Mike'S Sand & Gravel Inc → MIKE'S SAND & GRAVEL, INC.; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** (Paul) Mike  Mulchay → MIKE'S SAND & GRAVEL, INC.; 1993-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** (Paul) Mike  Mulchay → Mike'S Sand & Gravel Inc; 1993-03-01 to current/open; source msha-controller-operator-history