# Relationship history for MSHA mine 3500138

Current hierarchy: **Knife River Corporation → Morse Brothers Inc → WATTERS 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:** Morse Brothers Inc → WATTERS PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Watters Concrete Products Inc → WATTERS PIT; 1950-01-01 to 1989-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Fred W  Watters → WATTERS PIT; 1950-01-01 to 1989-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Fred W  Watters → Watters Concrete Products Inc; 1950-01-01 to 1989-08-16; source msha-controller-operator-history
- **operator_operates_mine:** J H & D Inc → WATTERS PIT; 1989-08-17 to 1993-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Dale K  Fischer → WATTERS PIT; 1989-08-17 to 1993-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Dale K  Fischer → J H & D Inc; 1989-08-17 to 1993-01-24; source msha-controller-operator-history
- **operator_operates_mine:** Morse Brothers Inc → WATTERS PIT; 1993-01-25 to 1998-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Morse Brothers Inc → Morse Brothers Inc; 1993-01-25 to 1998-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Morse Brothers Inc → WATTERS PIT; 1998-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → WATTERS PIT; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Morse Brothers Inc; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → WATTERS PIT; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Morse Brothers Inc; 2023-06-01 to current/open; source msha-controller-operator-history