# Relationship history for MSHA mine 1800539

Current hierarchy: **Richard B  Moran → Franklin Coal Yard, LLP → Tipple No.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:** John Duckworth Coal Company → Tipple No.1; 1974-12-08 to 2005-03-11; source msha-controller-operator-history
- **controller_controls_mine:** John  Duckworth → Tipple No.1; 1974-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Duckworth → John Duckworth Coal Company; 1974-12-08 to 2005-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Frankin Coal Yard, LLP → Tipple No.1; 2005-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard B  Moran → Tipple No.1; 2005-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard B  Moran → Frankin Coal Yard, LLP; 2005-03-12 to current/open; source msha-controller-operator-history