# Relationship history for MSHA mine 3400931

Current hierarchy: **Teeter Steve & Roy → Teeter'S Asphalt & Materials → Teeter 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

- **operator_operates_mine:** Epperson Trucking & Materials → Teeter Pit; 1950-01-01 to 1989-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Epperson Dale Sr → Teeter Pit; 1950-01-01 to 1989-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Epperson Dale Sr → Epperson Trucking & Materials; 1950-01-01 to 1989-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Teeter'S Asphalt & Materials → Teeter Pit; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teeter Steve & Roy → Teeter Pit; 1989-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teeter Steve & Roy → Teeter'S Asphalt & Materials; 1989-11-01 to current/open; source msha-controller-operator-history