# Relationship history for MSHA mine 1512136

Current hierarchy: **Wilder Gerald → Mc Neil Trucking Company Inc → Surface #1**

- 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:** Arnold David M → Surface #1; 1979-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Neil Trucking Company Inc → Surface #1; 1979-10-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Arnold David M → Mc Neil Trucking Company Inc; 1979-10-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Mc Neil Trucking Company Inc → Surface #1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilder Gerald → Surface #1; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilder Gerald → Mc Neil Trucking Company Inc; 1980-04-01 to current/open; source msha-controller-operator-history