# Relationship history for MSHA mine 4101142

Current hierarchy: **Connie  Spiegel → Shallow Ford Construction Company Inc → SHALLOW FORD 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:** Shallow Ford Construction Company Inc → SHALLOW FORD PIT; 1950-01-01 to 1983-06-19; source msha-controller-operator-history
- **controller_controls_mine:** G C  Slough → SHALLOW FORD PIT; 1950-01-01 to 1983-06-19; source msha-controller-operator-history
- **controller_controls_operator:** G C  Slough → Shallow Ford Construction Company Inc; 1950-01-01 to 1983-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Connie  Spiegel et al → SHALLOW FORD PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shallow Ford Construction Company Inc → SHALLOW FORD PIT; 1983-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Connie  Spiegel et al → Shallow Ford Construction Company Inc; 1983-06-20 to current/open; source msha-controller-operator-history