# Relationship history for MSHA mine 1100158

Current hierarchy: **Gerald A  Martin → Martin and Company → Oregon Quarry Portable**

- 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:** Oregon Stone Quarries Inc → Oregon Quarry Portable; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Seitz → Oregon Quarry Portable; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Seitz → Oregon Stone Quarries Inc; 1950-01-01 to 1986-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Oregon Stone Inc → Oregon Quarry Portable; 1986-05-01 to 2009-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Lawrence et al → Oregon Quarry Portable; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Lawrence et al → Oregon Stone Inc; 1986-05-01 to 2009-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Gerald A  Martin → Oregon Quarry Portable; 1997-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin and Company Excavating → Oregon Quarry Portable; 2009-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald A  Martin → Martin and Company Excavating; 2009-04-09 to current/open; source msha-controller-operator-history