# Relationship history for MSHA mine 1102944

Current hierarchy: **Gordon John A → Triad Engineering Inc → Coal Carbon Inc #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

- **operator_operates_mine:** Coal Carbon Inc → Coal Carbon Inc #1; 1993-07-01 to 1997-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Hoskins John A → Coal Carbon Inc #1; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoskins John A → Coal Carbon Inc; 1993-07-01 to 1997-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Triad Engineering Inc → Coal Carbon Inc #1; 1997-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gordon John A → Coal Carbon Inc #1; 1997-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon John A → Triad Engineering Inc; 1997-02-10 to current/open; source msha-controller-operator-history