# Relationship history for MSHA mine 3600143

Current hierarchy: **David  Smith → Harleysville Materials LLC → Harleysville Materials**

- 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:** M & M Stone Company → Harleysville Materials; 1950-01-01 to 1979-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Jon D  Oplinger → Harleysville Materials; 1950-01-01 to 1986-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Jon D  Oplinger → M & M Stone Company; 1950-01-01 to 1979-12-13; source msha-controller-operator-history
- **operator_operates_mine:** M & M Stone Co. → Harleysville Materials; 1979-12-14 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Brian L  Carpenter → Harleysville Materials; 1979-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian L  Carpenter → M & M Stone Co.; 1979-12-14 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Harleysville Materials LLC → Harleysville Materials; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Smith → Harleysville Materials; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Smith → Harleysville Materials LLC; 2011-01-01 to current/open; source msha-controller-operator-history