# Relationship history for MSHA mine 1516716

Current hierarchy: **Progress Energy Inc → Powell Mountain Coal Co., Inc. → Limestone Mine**

- 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:** Jerry W  Maggard → Limestone Mine; 1986-05-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shirl Coal Inc → Limestone Mine; 1989-09-01 to 1991-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Jerry W  Maggard → Shirl Coal Inc; 1989-09-01 to 1991-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Coleman → Limestone Mine; 1990-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Darby Coal Company → Limestone Mine; 1991-11-20 to 1993-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Amvest Corporation → Limestone Mine; 1991-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amvest Corporation → Kentucky Darby Coal Company; 1991-11-20 to 1993-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Magic Mining Inc → Limestone Mine; 1993-12-08 to 2003-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Coleman → Magic Mining Inc; 1993-12-08 to 2003-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Progress Energy Inc → Limestone Mine; 2000-11-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Powell Mountain Coal Co., Inc. → Limestone Mine; 2003-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Progress Energy Inc → Powell Mountain Coal Co., Inc.; 2003-06-12 to current/open; source msha-controller-operator-history