|
GB650739A
|
|
Improvements in plotting apparatus for stereophotogrammetric surveys
|
|
US2600948A
|
|
Plotting apparatus for photogrammetric surveys
|
|
GB493488A
|
|
Improvements in angle measuring instruments
|
|
US2221317A
|
|
Angle-measuring instrument
|
|
GB476147A
|
|
Improvements in telescopes
|
|
US2166102A
|
|
Telescope comprising two refracting and one reflecting systems
|
|
GB168316A
|
|
Improvements in theodolites
|
|
US1590461A
|
|
Optical apparatus
|
|
US1508585A
|
|
Theodolite
|
