# Relationship history for MSHA mine 1511097

Current hierarchy: **Swanton Corp → Kenerco Corp → Pine Creek**

- 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:** Massey Lee → Pine Creek; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Eastern Construction & Coal Corp → Pine Creek; 1978-03-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Sams Dexter R → Pine Creek; 1978-03-01 to 1978-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Sams Dexter R → Mid-Eastern Construction & Coal Corp; 1978-03-01 to 1978-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Energy Construction Corp → Pine Creek; 1978-11-01 to 1979-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Massey Lee → Energy Construction Corp; 1978-11-01 to 1979-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Raymond Dereume International Inc → Pine Creek; 1979-06-14 to 1980-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Dereume Raymond → Pine Creek; 1979-06-14 to 1980-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Dereume Raymond → Raymond Dereume International Inc; 1979-06-14 to 1980-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Swanton Corp → Pine Creek; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Mining Corp → Pine Creek; 1980-02-11 to 1980-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Sams Dexter R → Pine Creek; 1980-02-11 to 1980-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Sams Dexter R → Big Creek Mining Corp; 1980-02-11 to 1980-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Kenerco Corp → Pine Creek; 1980-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swanton Corp → Kenerco Corp; 1980-09-02 to current/open; source msha-controller-operator-history