Note 493 — Chapter XVII · THE INCANDESCENT MANTLE INDUSTRY—HISTORICAL AND GENERAL INTRODUCTION
Reading edition
Laigle, D. R. P. 216871 of December, 1909; see also D. R. P. 216877 and 219640.
[494] Michaud and Delasson, D. R. P. 210640, June, 1909; see also D. R. P. 227257.
[495] Zdanowich, E. 27755, 1908.
[496] Jasper, E. 30145, 1897.
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