# Relationship history for MSHA mine 4605770

Current hierarchy: **Robertson Glen → Deep Ford Mining Company Inc → Mine No2**

- 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:** Kelly John A → Mine No2; 1973-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Logan Mohawk Coal Company Inc → Mine No2; 1978-03-01 to 1980-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Kelly John A → Logan Mohawk Coal Company Inc; 1978-03-01 to 1980-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Robertson Glen → Mine No2; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Deep Ford Mining Company Inc → Mine No2; 1980-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson Glen → Deep Ford Mining Company Inc; 1980-03-21 to current/open; source msha-controller-operator-history