# Relationship history for MSHA mine 3102263

Current hierarchy: **Wayne  Cassavaugh → CAROLINA SAND, INC → WALKER SAND 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wayne  Cassavaugh → WALKER SAND PIT; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CAROLINA SAND, INC → WALKER SAND PIT; 2011-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Cassavaugh → CAROLINA SAND, INC; 2011-03-18 to current/open; source msha-controller-operator-history