Upward view showing the junction between the pan-formed reinforced-concrete joist ceiling of the second-floor expansion room above the office at the Hoffmann-Hayman factory and what was originally a 1932 exterior masonry face of the plant (now an interior wall enclosed by the expansion), photographed on 1 February 2023 — in the upper two-thirds, parallel flat-sided concrete joists run across the frame with board-formwork grain and round knot-hole imprints pressed into their sides, and the bays between them carry the characteristic ribbed soffit pattern left by removable corrugated-steel pan forms; on the flat face of one central joist a cursive graphite-pencil inscription reads 'FEBRERO - 11 - 53' (February 11, 1953), a second pencil date by the same hand or cohort as the three 'Marzo' 1952–54 dates on the east wall of the room and the later 'Agosto 8 – 56' mark on the adjacent ceiling joist; below the ceiling, the top of the former exterior masonry face of the original 1932 plant meets the expansion soffit, its painted surface streaked with long vertical whitewash drip-runs from when the new interior ceiling above was painted, and a wooden jamb is visible at lower-right in what appears to be a post-expansion cut opening in the old exterior wall; a thin black signal cable runs horizontally below the inscribed joist
