# Relationship history for MSHA mine 4605196

Current hierarchy: **Pittston Company → Excel Development Inc → #1 Surface**

- 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:** Williams L Roger → #1 Surface; 1976-05-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Energy Corp → #1 Surface; 1976-06-16 to 1977-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Williams L Roger → General Energy Corp; 1976-06-16 to 1977-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Excel Development Corp → #1 Surface; 1977-06-30 to 1977-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Coal & Dock Company Inc → #1 Surface; 1977-06-30 to 1977-08-17; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Coal & Dock Company Inc → Excel Development Corp; 1977-06-30 to 1977-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Excel Development Inc → #1 Surface; 1977-08-18 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Evergreen Industries Inc → #1 Surface; 1977-08-18 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Evergreen Industries Inc → Excel Development Inc; 1977-08-18 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → #1 Surface; 1979-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Excel Development Inc → #1 Surface; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Excel Development Inc; 1979-07-01 to current/open; source msha-controller-operator-history