The Architect & engineer of California and the Pacific Coast (1905)
San Francisco, Calif. : Architect and Engineer Co · leaf 479
toallow it to settle elsewhere, but it consumes it through the air tube, andall of the dirt, disease germs, fleas and other small insects with which thecleaning tool comes in contact are drawn into the automatic self-cleaner.All of this substance immediately drops to the bottom of the nTachine… … It would seem that tlie long-looked-lUr problem has l.ieen solved, com-bining the three elements in one machine, i. e.. medium, low and highvacuum, which can be positively obtained in the new Giant Model A. The government specifications lor the United States Sub-Treasurybuilding in San Francisco…
Architecture · Building
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