# Relationship history for MSHA mine 1517381

Current hierarchy: **Florida Progress Corporation → Kentucky May Coal Company Inc → Harmon #2**

- 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:** Florida Progress Corporation → Harmon #2; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Danny  Blankenship → Harmon #2; 1992-08-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky May Coal Company Inc → Harmon #2; 1993-03-01 to 1993-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kentucky May Coal Company Inc; 1993-03-01 to 1993-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Dynasty Coal Inc → Harmon #2; 1993-04-29 to 1995-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Blankenship → Dynasty Coal Inc; 1993-04-29 to 1995-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Letcher County Coal Inc → Harmon #2; 1995-07-11 to 1997-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Henry  Lyon → Harmon #2; 1995-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Lyon → Letcher County Coal Inc; 1995-07-11 to 1997-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky May Coal Company Inc → Harmon #2; 1997-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kentucky May Coal Company Inc; 1997-02-14 to current/open; source msha-controller-operator-history