# Relationship history for MSHA mine 1509648

Current hierarchy: **Newcomb Theodore → Newcomb Coal Company → No 1 Mine**

- 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:** Goebel  Zeller et al → No 1 Mine; 1974-09-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Faith Coal Sales Inc → No 1 Mine; 1976-04-28 to 1977-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Goebel  Zeller et al → Faith Coal Sales Inc; 1976-04-28 to 1977-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Bill R  Wallace et al → Faith Coal Sales Inc; 1976-04-28 to 1977-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Newcomb Coal Company → No 1 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Newcomb Theodore → No 1 Mine; 1977-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newcomb Theodore → Newcomb Coal Company; 1977-03-04 to current/open; source msha-controller-operator-history