View source for Patent US-1901-691719

The provision of a structure whereby observation can be maintained, in fixed position, at great height, passage to and from the same being easy, by way of an elevator car.
* Inventor location: New York, New York county, NY (FIPSloc=36061, imputed by [[HistPat]])
* Applicant location:  John L. Adams of New York, NY
* Witnesses as shown on the final text page: [[Amelie Coupe]] and [[Frank J. Coupe]]
=== Sources ===
{{USpatentsources|691719}}

* Note: Greth is the assignor to of one-half to Adams. We are not certain about the direction of this assignment, not to mention the "one-half". These men could possibly both be inventors.
{{Patent
|Year filed=1901
|Year granted=1902
|Office=US
|Patent number=691719
|Inventors=Joseph Greth
|Inventor country=US
|Applicant person=John L. Adams
|Applicant type=INDIV
|Applicant is inventor=Yes
|Original title=Balloon-Observatory
|English title=Balloon-observatory
|Tech field=aerial observation; balloons; cables; braking
|Filing date=1901/06/08
|Application number=1901063754
|Grant date=1902/01/21
|Granted=Yes
|Related to aircraft=Yes
|Serial number=63754
|Assigned to=John L. Adams
|National tech categories=USPC 244/33; USPC 104/22; USPC 187/407; USPC 244/137.2
|IPCs=IPC B64B1/00
|CPCs=CPC B64B1/40
|Family year=1901
|First filing=Yes
|Application ID=46743225
|INPADOC family ID=43631762
|Number of text pages=2
|Number of diagram pages=2
|Number of figures=5
|Number of claims=4
}}