# Relationship history for MSHA mine 4801528

Current hierarchy: **Norman  Sanders → Sanders Gravel & Excavating Inc → SANDERS 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:** Sanders Gravel & Excavating Inc → SANDERS PIT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman  Sanders → SANDERS PIT; 1995-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman  Sanders → Sanders Gravel & Excavating Inc; 1995-05-01 to current/open; source msha-controller-operator-history