# Relationship history for MSHA mine 3607027

Current hierarchy: **Albert George & Michael Keklak → New County Coal Company → Underwood Bank**

- 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:** Degilio Nicholas → Underwood Bank; 1976-09-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Degilio Trucking Company → Underwood Bank; 1980-08-01 to 1986-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Degilio Nicholas → Degilio Trucking Company; 1980-08-01 to 1986-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Bone George → Underwood Bank; 1981-09-01 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Bechtel William → Underwood Bank; 1986-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A B C Coal Company Inc → Underwood Bank; 1986-08-08 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Bechtel William → A B C Coal Company Inc; 1986-08-08 to 1988-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Anthracite Resources → Underwood Bank; 1988-03-07 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Bone George → Anthracite Resources; 1988-03-07 to 1994-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Albert George & Michael Keklak → Underwood Bank; 1994-02-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** New County Coal Company → Underwood Bank; 1994-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert George & Michael Keklak → New County Coal Company; 1994-05-02 to current/open; source msha-controller-operator-history