United States Patent 3257128
US Patent References:
Binder case construction for books
- - 2390125
Binder case construction for books
- - 2486330
Bag making, filling and sealing machine
- - 2765605
Book backbone structure with concealed rivet means and method of making same
- - 2772427
Wrapper indexing mechanism for wrapping machines
- - 2871639
Binder case construction for books
- - 2390125
Binder case construction for books
- - 2486330
Bag making, filling and sealing machine
- - 2765605
Book backbone structure with concealed rivet means and method of making same
- - 2772427
Wrapper indexing mechanism for wrapping machines
- - 2871639
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Other Classes:
283/63.100, 281/29
US Patent References:
| 3190678 | Casings for books |