# Relationship history for MSHA mine 1516483

Current hierarchy: **Anthony V  Lanham → Lanham Coal Dock → Lanham Coal Dock**

- 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:** Horizon Natural Resources Incorporated → Lanham Coal Dock; 1986-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Iceland Terminal Inc → Lanham Coal Dock; 1988-09-01 to 1989-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Lanham John → Lanham Coal Dock; 1988-09-01 to 1989-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Lanham John → Iceland Terminal Inc; 1988-09-01 to 1989-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Addwest Mining Inc → Lanham Coal Dock; 1989-06-20 to 1991-09-05; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Addwest Mining Inc; 1989-06-20 to 1991-09-05; source msha-controller-operator-history
- **operator_operates_mine:** Marine Coal Sales Company → Lanham Coal Dock; 1991-09-06 to 1991-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Miller Dick E & Conas Trading → Lanham Coal Dock; 1991-09-06 to 1991-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Miller Dick E & Conas Trading → Marine Coal Sales Company; 1991-09-06 to 1991-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Addwest Mining Inc → Lanham Coal Dock; 1991-11-27 to 1994-12-05; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Addwest Mining Inc; 1991-11-27 to 1994-12-05; source msha-controller-operator-history
- **operator_operates_mine:** Lanham Coal Dock → Lanham Coal Dock; 1994-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Anthony V  Lanham → Lanham Coal Dock; 1994-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony V  Lanham → Lanham Coal Dock; 1994-12-06 to current/open; source msha-controller-operator-history