# Relationship history for MSHA mine 3503522

Current hierarchy: **Alton E  Sullivan → A J Crushing Inc → NISSEN 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

- **controller_controls_mine:** Alton E  Sullivan et al → NISSEN PIT; 1992-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A J Crushing Inc → NISSEN PIT; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alton E  Sullivan et al → A J Crushing Inc; 2001-03-01 to current/open; source msha-controller-operator-history