# Relationship history for MSHA mine 4502895

Current hierarchy: **Jason  Messmer; Randy  Rognlin → Northwest Rock Inc → SCHOCH 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** John D  Friend et al → SCHOCH PIT; 1950-01-01 to 2006-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Monte Sand & Gravel → SCHOCH PIT; 1981-04-01 to 1996-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Schock → SCHOCH PIT; 1981-04-01 to 1996-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Schock → Monte Sand & Gravel; 1981-04-01 to 1996-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Wynoochee Resources Inc → SCHOCH PIT; 1996-07-01 to 1997-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Rognlin → SCHOCH PIT; 1996-07-01 to 1997-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Rognlin → Wynoochee Resources Inc; 1996-07-01 to 1997-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Northwest Rock Inc → SCHOCH PIT; 1997-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John D  Friend et al → Northwest Rock Inc; 1997-08-05 to 2006-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Rognlin → SCHOCH PIT; 2006-03-01 to 2017-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Rognlin → Northwest Rock Inc; 2006-03-01 to 2017-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Rognlin et al → SCHOCH PIT; 2017-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Rognlin et al → Northwest Rock Inc; 2017-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Messmer et al → Northwest Rock Inc; 2017-12-29 to current/open; source msha-controller-operator-history