# Relationship history for MSHA mine 3500200

Current hierarchy: **Beers Larry → Larry Beers Logging → Camp 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

- **controller_controls_mine:** Lonny  Bessett → Camp Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roseburg Sand & Gravel Company → Camp Pit; 1950-01-01 to 1979-08-07; source msha-controller-operator-history
- **controller_controls_mine:** John V  Metzger et al → Camp Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John V  Metzger et al → Roseburg Sand & Gravel Company; 1950-01-01 to 1979-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Flintstone Crushing & Construction Company → Camp Pit; 1979-08-08 to 1981-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Hanes Aubrey W → Camp Pit; 1979-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanes Aubrey W → Flintstone Crushing & Construction Company; 1979-08-08 to 1981-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Portable Rock Production Company Inc → Camp Pit; 1981-02-11 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Lonny  Bessett → Portable Rock Production Company Inc; 1981-02-11 to 1984-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Kiewit Pacific Co. → Camp Pit; 1984-07-01 to 1989-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Peter Kiewit Sons' Inc → Camp Pit; 1984-07-01 to 2023-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Kiewit Pacific Co.; 1984-07-01 to 1989-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Larry Beers Logging → Camp Pit; 1989-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Beers Larry → Camp Pit; 1989-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beers Larry → Larry Beers Logging; 1989-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kiewit Infrastructure Group Inc → Camp Pit; 2023-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kiewit Infrastructure Group Inc → Kiewit Pacific Co.; 2023-09-19 to 1989-10-12; source msha-controller-operator-history