# Relationship history for MSHA mine 0404795

Current hierarchy: **Donald D  Chapin Jr → The Don Chapin Company, Inc. → Pine Canyon Quarry**

- 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:** Granite Construction Inc → Pine Canyon Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Co → Pine Canyon Quarry; 1986-03-01 to 2015-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Co; 1986-03-01 to 2015-11-19; source msha-controller-operator-history
- **controller_controls_mine:** Donald D  Chapin Jr → Pine Canyon Quarry; 1998-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Don Chapin Company, Inc. → Pine Canyon Quarry; 2015-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald D  Chapin Jr → The Don Chapin Company, Inc.; 2015-11-20 to current/open; source msha-controller-operator-history