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![[Theoretical drawings]](https://tile.loc.gov/storage-services/service/pnp/pmru/14200/14251_150px.jpg#h=101&w=150/full/!400,400/0/default.jpg)
![[Rudolph drawings]](https://tile.loc.gov/storage-services/service/pnp/pmru/11400/11433_150px.jpg#h=102&w=150/full/!400,400/0/default.jpg)