# Relationship history for MSHA mine 4606705

Current hierarchy: **Borgman Lawrence W → Pioneer Coal Sales Inc → Zero Tipple**

- 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:** Borgman Lawrence W → Zero Tipple; 1981-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Sales Inc → Zero Tipple; 1983-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borgman Lawrence W → Pioneer Coal Sales Inc; 1983-10-01 to current/open; source msha-controller-operator-history