# Relationship history for MSHA mine 0504642

Current hierarchy: **T S Landfill Inc; Redvale Sand & Gravel Inc → Maverick Sand & Gravel → WILD STEER**

- 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

- **controller_controls_mine:** T S Landfill Inc et al → WILD STEER; 1998-11-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maverick Sand & Gravel → WILD STEER; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T S Landfill Inc et al → Maverick Sand & Gravel; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redvale Sand & Gravel Inc et al → Maverick Sand & Gravel; 1999-04-01 to current/open; source msha-controller-operator-history