# Relationship history for MSHA mine 3604702

Current hierarchy: **Harner Roy E & Delbert L Artz → Post Coal Company → Skidmore Slope**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Locustdale Mining Inc → Skidmore Slope; 1973-06-01 to 1978-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Dando Frederick P Et Al → Skidmore Slope; 1973-06-01 to 1978-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Dando Frederick P Et Al → Locustdale Mining Inc; 1973-06-01 to 1978-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Post Coal Company → Skidmore Slope; 1978-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harner Roy E & Delbert L Artz → Skidmore Slope; 1978-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harner Roy E & Delbert L Artz → Post Coal Company; 1978-08-15 to current/open; source msha-controller-operator-history