# Relationship history for MSHA mine 0402280

Current hierarchy: **Gretsinger Warren → Calaveras Rock Inc → Calaveras Rock Incorporated**

- 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 → Calaveras Rock Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce W  Woolpert  et al → Calaveras Rock Incorporated; 1950-01-01 to 2012-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Calaveras Rock Incorporated; 1979-09-01 to 1981-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1979-09-01 to 1981-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Granite Rock Company → Calaveras Rock Incorporated; 1981-04-14 to 1982-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Bruce W  Woolpert  et al → Granite Rock Company; 1981-04-14 to 1982-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Granite Construction Company → Calaveras Rock Incorporated; 1982-12-13 to 1986-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Granite Construction Inc → Granite Construction Company; 1982-12-13 to 1986-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Calaveras Rock Inc → Calaveras Rock Incorporated; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gretsinger Warren → Calaveras Rock Incorporated; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gretsinger Warren → Calaveras Rock Inc; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas H  Squeri et al → Calaveras Rock Incorporated; 2012-07-23 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas H  Squeri et al → Granite Rock Company; 2012-07-23 to 1982-12-12; source msha-controller-operator-history
- **controller_controls_mine:** Peter J  Lemon → Calaveras Rock Incorporated; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter J  Lemon → Granite Rock Company; 2023-01-01 to 1982-12-12; source msha-controller-operator-history