# Relationship history for MSHA mine 3502789

Current hierarchy: **Allyn  Ford → Roseburg Lumber Company → Roseburg Lumber Pit**

- 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:** Roseburg Lumber Company → Roseburg Lumber Pit; 1950-01-01 to 1978-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Allyn  Ford → Roseburg Lumber Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allyn  Ford → Roseburg Lumber Company; 1950-01-01 to 1978-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Spencer George D → Roseburg Lumber Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S D Spencer & Son → Roseburg Lumber Pit; 1978-04-16 to 1979-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Spencer George D → S D Spencer & Son; 1978-04-16 to 1979-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Roseburg Lumber Company → Roseburg Lumber Pit; 1979-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allyn  Ford → Roseburg Lumber Company; 1979-01-31 to current/open; source msha-controller-operator-history