High-pressure Diaphragm Openings

1 Page Vertical

Questar advertisement, <em>Sky and Telescope</em>, March 1970 — Questar advertisement, *Sky and Telescope*, March 1970. Questar Corporation

Sky and Telescope, July 1969, IFC.
Sky and Telescope, October 1969, IFC.
Sky and Telescope, March 1970, IFC.
Sky and Telescope, November 1970, IFC.

2/3rds Page Vertical

Questar advertisement, <em>Scientific American</em>, August 1969 — Questar advertisement, *Scientific American*, August 1969. Questar Corporation

Scientific American, July 1969, 95.
Scientific American, August 1969, 56.
Scientific American, January 1970, 143.
Scientific American, February 1970, 43.
Natural History, April 1970, 64.
Modern Photography, April 1970, 6.
Modern Photography, August 1970, 8.
Scientific American, November 1970, 43.
Modern Photography, April 1971, 6.