# Relationship history for MSHA mine 1511456

Current hierarchy: **Mills Vance → Mills & Garland Construction Company → Mills & Garland Const Co**

- 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:** Mills & Garland Construction Company → Mills & Garland Const Co; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mills Vance Et Al → Mills & Garland Const Co; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mills Vance Et Al → Mills & Garland Construction Company; 1978-07-01 to current/open; source msha-controller-operator-history