PL41960B1 - - Google Patents

Download PDF

Info

Publication number
PL41960B1
PL41960B1 PL41960A PL4196057A PL41960B1 PL 41960 B1 PL41960 B1 PL 41960B1 PL 41960 A PL41960 A PL 41960A PL 4196057 A PL4196057 A PL 4196057A PL 41960 B1 PL41960 B1 PL 41960B1
Authority
PL
Poland
Prior art keywords
helium
hearing
organs
skull
external
Prior art date
Application number
PL41960A
Other languages
English (en)
Polish (pl)
Filing date
Publication date
Application filed filed Critical
Publication of PL41960B1 publication Critical patent/PL41960B1/pl

Links

PL41960A 1957-04-05 PL41960B1 (es)

Publications (1)

Publication Number Publication Date
PL41960B1 true PL41960B1 (es) 1959-04-15

Family

ID=

Similar Documents

Publication Publication Date Title
US2353070A (en) Headphone
US4446576A (en) Safe guard protective equipment for fighting art
US20160198781A1 (en) Garment With Sound Absorbing Layer
US4261432A (en) Airline earphone structure
US20190014842A1 (en) Garment With Sound Absorbing Layer
ES2554362T3 (es) Auriculares acústicos
WO2008014172A3 (en) Double hearing protection device
CN106132364A (zh) 耳塞和包括其的耳塞组件
EP0836841A3 (en) Headband with dual material construction
US4615050A (en) Headband structure for ear coverings
US2488235A (en) Diving mask with pressure equalizing ear cups
US3016054A (en) Device for protecting ears from high intensity noise
US4015294A (en) Diving helmet assembly
PL41960B1 (es)
EP1034735A3 (en) Signal enhancing and artifact reducing blood pressure cuff
US5604811A (en) Stethoscope and headset system
Molvaer et al. Hearing damage risk to divers operating noisy tools under water
JPS61288525A (ja) ヘルメツトに組み込まれた無線通信装置
Rice et al. Design factors and use of ear protection
Pääkkönen et al. Active noise reduction in aviation helmets during a military jet trainer test flight
CN205144868U (zh) 双罩杯结构防噪声耳罩
US2587035A (en) Earplug
JPS6125779Y2 (es)
FI58054B (fi) Hoerselskydd foer anvaendning tillsammans med glasoegonskalmar
CN207100644U (zh) 一种船舶用安全帽