# Relationship history for MSHA mine 1511596

Current hierarchy: **Sturgill Leslie → Switch Energy Corp → Chickasaw #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:** Madden Allen R → Chickasaw #1; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tracy Coal Company Inc → Chickasaw #1; 1978-05-01 to 1979-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Meade Ersel V → Chickasaw #1; 1978-05-01 to 1979-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Meade Ersel V → Tracy Coal Company Inc; 1978-05-01 to 1979-12-06; source msha-controller-operator-history
- **operator_operates_mine:** M & L Coal Company → Chickasaw #1; 1979-12-07 to 1980-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Lambert Freeman & Ralph Mc Kee → Chickasaw #1; 1979-12-07 to 1980-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Lambert Freeman & Ralph Mc Kee → M & L Coal Company; 1979-12-07 to 1980-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Coal Company Inc → Chickasaw #1; 1980-10-23 to 1981-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Madden Allen R → Magnum Coal Company Inc; 1980-10-23 to 1981-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Switch Energy Corp → Chickasaw #1; 1981-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sturgill Leslie → Chickasaw #1; 1981-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sturgill Leslie → Switch Energy Corp; 1981-04-20 to current/open; source msha-controller-operator-history