United States Patent 2432515
US Patent References:
Dental film mount
- - 1840719

Multiple picture projection slide
- - 2291173

Lantern slide
- - 1500025

Lantern slide
- - 1524797

Call device for public rooms
- - 1464447


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Primary Class:
40/701
Other Classes:
40/735, 40/709
US Patent References:
2234427Film slide holder
1465353Picture slide
2271530Film holder
2153149Lantern slide
2227973Transparency slide holder