# Relationship history for MSHA mine 3610255

Current hierarchy: **Keith  Libengood → Environmental Rubber Solutions → BER**

- 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

- **operator_operates_mine:** Blairsville Environmental Rubber LLC → BER; 2018-10-10 to 2022-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Eco Genius Solutions et al → BER; 2018-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eco Genius Solutions et al → Blairsville Environmental Rubber LLC; 2018-10-10 to 2022-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Bieda et al → Blairsville Environmental Rubber LLC; 2018-10-10 to 2022-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Richard W  Johnson et al → Blairsville Environmental Rubber LLC; 2018-10-10 to 2022-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Labor Services Corp et al → Blairsville Environmental Rubber LLC; 2018-10-10 to 2022-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Environmental Rubber Solutions → BER; 2022-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Libengood → BER; 2022-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Libengood → Environmental Rubber Solutions; 2022-10-18 to current/open; source msha-controller-operator-history