# Relationship history for MSHA mine 2100525

Current hierarchy: **James R  Tow → Tow Brothers Construction Inc → C.R. CRUSHER 29074**

- 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:** Hanover Sand & Gravel Company → C.R. CRUSHER 29074; 1950-01-01 to 1988-08-23; source msha-controller-operator-history
- **controller_controls_mine:** Miller Wilfred → C.R. CRUSHER 29074; 1950-01-01 to 1988-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Miller Wilfred → Hanover Sand & Gravel Company; 1950-01-01 to 1988-08-23; source msha-controller-operator-history
- **controller_controls_mine:** James R  Tow → C.R. CRUSHER 29074; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tow Brothers Construction Inc → C.R. CRUSHER 29074; 1988-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Tow → Tow Brothers Construction Inc; 1988-08-24 to current/open; source msha-controller-operator-history