|
US3189951A
|
|
Concrete door
|
|
US3230679A
|
|
Wall structure having prefab joist sections
|
|
US3222840A
|
|
Wall structure and building block therefor
|
|
US3233380A
|
|
Wall structure and block therefor
|
|
US3196582A
|
|
Wall and block therefor
|
|
US3103154A
|
|
Bomb shelter ventilation apparatus
|
|
US3150618A
|
|
Door structure
|
|
US3112578A
|
|
Wall structure
|
|
US3159118A
|
|
Door cleaning apparatus
|
|
US3093098A
|
|
Door structure for bomb shelter
|
|
US3166873A
|
|
Reinforced wall structure
|
|
US3232022A
|
|
Method of making a family blast shelter in a basement
|
|
US3093097A
|
|
Bomb shelter
|
|
US3185873A
|
|
Generator and ventilation means
|
|
US3159093A
|
|
Door structure
|
|
US3092842A
|
|
Toilet device
|
|
US3170267A
|
|
Wall structure with interlocked blocks
|
|
US3215561A
|
|
Apparatus for generating electricity and heating articles
|
|
US3093057A
|
|
Bombshelter ventilation means
|
|
US3078470A
|
|
Toilet
|
