# Relationship history for MSHA mine 1201617

Current hierarchy: **Hugh  Gallivan → Mid-America Sand & Gravel → Perrysville Pit**

- 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:** Pickitt & Schreur Company → Perrysville Pit; 1950-01-01 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Rieth-Riley Construction Company Inc → Perrysville Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rieth-Riley Construction Company Inc → Pickitt & Schreur Company; 1950-01-01 to 1983-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Hugh  Gallivan  et al → Perrysville Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Glascock Louis H & Loren E → Perrysville Pit; 1979-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple G Gravel → Perrysville Pit; 1983-11-08 to 1986-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Glascock Louis H & Loren E → Triple G Gravel; 1983-11-08 to 1986-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Mid-America Sand & Gravel → Perrysville Pit; 1986-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hugh  Gallivan  et al → Mid-America Sand & Gravel; 1986-06-17 to current/open; source msha-controller-operator-history