# Relationship history for MSHA mine 4605073

Current hierarchy: **Robertson Glen → Deep Ford Mining Company Inc → Mine No 1**

- 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 No 1; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peach Creek Processing Company → Mine No 1; 1976-03-18 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Kelly John A → Peach Creek Processing Company; 1976-03-18 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Deep Ford Mining Company Inc → Mine No 1; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robertson Glen → Mine No 1; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robertson Glen → Deep Ford Mining Company Inc; 1979-11-01 to current/open; source msha-controller-operator-history