# Relationship history for MSHA mine 1515805

Current hierarchy: **Patterson Bill → Swan Pond Coal Company → #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:** Patterson Bill Et Al → #1; 1983-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gordon Coal Company → #1; 1986-10-01 to 1988-10-10; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Bill Et Al → Gordon Coal Company; 1986-10-01 to 1988-10-10; source msha-controller-operator-history
- **operator_operates_mine:** Double A Mining Company → #1; 1988-10-11 to 1991-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Head Jerry--Darrell Teague Et Al → #1; 1988-10-11 to 1991-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Head Jerry--Darrell Teague Et Al → Double A Mining Company; 1988-10-11 to 1991-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Hubbard  et al → #1; 1989-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & H Mining → #1; 1991-05-02 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Hubbard  et al → C & H Mining; 1991-05-02 to 1991-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd  Cole  et al → C & H Mining; 1991-05-02 to 1991-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Swan Pond Coal Company → #1; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patterson Bill Et Al → #1; 1991-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patterson Bill Et Al → Swan Pond Coal Company; 1991-06-24 to current/open; source msha-controller-operator-history