# Relationship history for MSHA mine 4403995

Current hierarchy: **Dalrymple Holding Corp → Cedar Mountain Stone Corp → MITCHELL 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

- **operator_operates_mine:** A H Smith Stone Company → MITCHELL QUARRY; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith → MITCHELL QUARRY; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith → A H Smith Stone Company; 1950-01-01 to 1988-11-22; source msha-controller-operator-history
- **operator_operates_mine:** A H Smith Associates Limited Partnership → MITCHELL QUARRY; 1988-11-23 to 1995-02-05; source msha-controller-operator-history
- **controller_controls_mine:** A H  Smith Jr et al → MITCHELL QUARRY; 1988-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A H  Smith Jr et al → A H Smith Associates Limited Partnership; 1988-11-23 to 1995-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Henry R  Smith et al → A H Smith Associates Limited Partnership; 1988-11-23 to 1995-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Mountain Stone Corp → MITCHELL QUARRY; 1995-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dalrymple Holding Corp → MITCHELL QUARRY; 1995-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dalrymple Holding Corp → Cedar Mountain Stone Corp; 1995-02-06 to current/open; source msha-controller-operator-history