# Relationship history for MSHA mine 3607031

Current hierarchy: **Petersville Sleigh Ltd → A & T Associates Inc → Sheridan**

- 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:** Petersville Sleigh Ltd Et Al → Sheridan; 1980-05-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & T Associates Inc → Sheridan; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Petersville Sleigh Ltd Et Al → A & T Associates Inc; 1980-09-01 to current/open; source msha-controller-operator-history