# Relationship history for MSHA mine 3501566

Current hierarchy: **Cody Logging & Construction Company → Cody Logging & Construction Company → Wall 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:** Lloyd M Hill Inc → Wall Pit; 1950-01-01 to 1980-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Hill Lloyd M Inc → Wall Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill Lloyd M Inc → Lloyd M Hill Inc; 1950-01-01 to 1980-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Cody Logging & Construction Company → Wall Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spaur Vern → Wall Pit; 1979-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Silver Crest Excavating Company → Wall Pit; 1980-06-11 to 1981-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Spaur Vern → Silver Crest Excavating Company; 1980-06-11 to 1981-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Cody Logging & Construction Company → Wall Pit; 1981-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cody Logging & Construction Company → Cody Logging & Construction Company; 1981-04-30 to current/open; source msha-controller-operator-history