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Class Information
Number: D25/107
Name: Building units and construction elements > Architectural stock material > Transparent or translucent > Three or more pattern repeats about axis on side (17) > Hollow type

Patents under this class:

Patent Number Title Of Patent Date Issued
D300061 Glass brick Feb. 28, 1989
D289432 Hollow tile for solar heating system Apr. 21, 1987

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